Analog Devices

AD7685BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices

Name: AD7685BCPZ
Brand: Analog Devices
Price: 8.1 USD
Availability: InStock

MPN: AD7685BCPZ ✓ Active

In Stock Ships in 1-3 business days

2.3 V to 5.5 V Vdss 10-LFCSP-WD (3x3 mm) Package

From $8.1 USD / Unit

MOQ: 1 |

Price updated: 2026-08-22

Volume Pricing

Qty	Unit Price	Extended
1	$12.5	$12.50
10	$11.25	$112.50
100	$9.8	$980.00
500	$8.9	$4,450.00
1,000	$8.1	$8,100.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for AD7685BCPZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

AD7685BCPZ-R2

✅ Drop-In

📦 10-LFCSP-WD (3x3 mm)

Same device, tape-and-reel packaging

📋 Reference alternative (not in catalog)

AD7685BCPZRL7

✅ Drop-In

📦 10-LFCSP-WD (3x3 mm)

Same device, different reel size

📋 Reference alternative (not in catalog)

AD7690BCPZRL7

✅ Drop-In

Analog Devices

📦 10-LFCSP-WD (3x3 mm)

18 bits · 400 kSPS · 1 · Differential · SPI, DSP, MICROWIRE, QSPI · SAR · ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR) · 4.75 V to 5.25 V

✓ In Stock

$17.6 / Unit

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AD7980BCPZ-RL7

✅ Drop-In

Analog Devices

📦 10-LFCSP-WD (3x3 mm)

16 bits · 1 MSPS · 1 · Pseudo-differential · SPI · SAR · External · 2.3 V ~ 5.5 V

✓ In Stock

$18 / Unit

View Datasheet →

AD7980BCPZ-RL7

✅ Drop-In

Analog Devices

📦 10-LFCSP-WD (3x3 mm)

16 bits · 1 MSPS · 1 · Pseudo-differential · SPI · SAR · External · 2.3 V ~ 5.5 V

✓ In Stock

$18 / Unit

View Datasheet →

AD7685BCPZ Maximum Ratings & Electrical Characteristics

Resolution	16 bits
Sampling Rate	250 kSPS
Input Type	Pseudo-differential
Supply Voltage	2.3 V to 5.5 V
Power Consumption	3.5 mW at 5 V
Interface	SPI
Package	10-LFCSP-WD (3x3 mm)
Operating Temperature	-40C to +125C
No Missing Codes	Yes
SNR	[DATA_NEEDED: SNR]
THD	[DATA_NEEDED: THD]
INL	[DATA_NEEDED: INL]
DNL	[DATA_NEEDED: DNL]
Reference Voltage	External, 0.5V to VDD
Mounting Type	Surface Mount
RoHS Status	Compliant

AD7685BCPZ Pin Configuration

Pin 1	VDD — Power supply, 2.3V to 5.5V
Pin 2	GND — Ground
Pin 3	REF — Reference input, external
Pin 4	IN+ — Positive analog input
Pin 5	IN- — Negative analog input
Pin 6	SDO — Serial data output
Pin 7	SCK — Serial clock input
Pin 8	CS — Chip select, active low
Pin 9	PD — Power down, active high
Pin 10	EP — Exposed pad, connect to GND

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

AD7685BCPZ is suitable for 6 applications: Battery-Powered Instrumentation, Data Acquisition Systems, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Sensor Signal Conditioning.

📱

Battery-Powered Instrumentation

The AD7685BCPZ's low power consumption (3.5 mW at 5 V) and wide supply range (2.3 V to 5.5 V) make it ideal for portable instruments. Its 16-bit resolution ensures accurate measurements, while the small LFCSP package saves board space. The SPI interface simplifies connection to low-power microcontrollers, and power-down modes extend battery life in duty-cycled applications.

Recommended

AD7980BCPZ (Higher-speed alternative for faster sampling) AD7690BCPZRL7 · Analog Devices

🏭

Data Acquisition Systems

The AD7685BCPZ provides 16-bit resolution at 250 kSPS, making it suitable for multi-channel data acquisition systems. Its pseudo-differential input rejects common-mode noise, and the SPI interface supports daisy-chaining for multiple channels. The device's low power and small footprint enable high-density designs in industrial and laboratory equipment.

Recommended

AD7980BCPZ (Higher-speed ADC for faster sampling) AD7690BCPZRL7 · Analog Devices

🏭

Industrial Process Control

In industrial process control, the AD7685BCPZ offers the accuracy and speed needed for monitoring sensors and actuators. Its 16-bit resolution ensures precise control, while the wide supply range accommodates various industrial power rails. The device's robust operating temperature range (-40C to +125C) suits harsh environments, and the SPI interface integrates easily with industrial microcontrollers.

Recommended

AD7980BCPZ (Higher-speed option for faster control loops) AD7690BCPZRL7 · Analog Devices

💊

Medical Instrumentation

The AD7685BCPZ is well-suited for medical devices such as patient monitors and diagnostic equipment. Its low power consumption is critical for battery-operated devices, and the 16-bit resolution provides the accuracy required for vital sign measurements. The compact LFCSP package allows miniaturization, and the SPI interface enables easy integration with medical-grade microcontrollers.

Recommended

AD7980BCPZ (Higher-speed ADC for faster data acquisition) AD7690BCPZRL7 · Analog Devices

🔧

Portable Test Equipment

For portable test equipment like handheld multimeters and data loggers, the AD7685BCPZ offers a balance of performance and power efficiency. Its 250 kSPS sampling rate is sufficient for many test applications, and the low power consumption extends battery life. The small package and SPI interface make it easy to design into compact, battery-powered devices.

Recommended

AD7980BCPZ (Higher-speed alternative for faster measurements) AD7690BCPZRL7 · Analog Devices

🧩

Sensor Signal Conditioning

The AD7685BCPZ is ideal for conditioning signals from sensors such as temperature, pressure, and strain gauges. Its 16-bit resolution captures fine sensor variations, and the pseudo-differential input helps reject noise. The device's low power and small size are advantageous in distributed sensor networks, and the SPI interface allows easy connection to sensor hub microcontrollers.

Recommended

AD7980BCPZ (Higher-speed ADC for dynamic sensors) AD7690BCPZRL7 · Analog Devices

Recommended Products Summary

AD7980BCPZ Higher-speed alternative for faster sampling Used in: Battery-Powered Instrumentation, Data Acquisition Systems, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Sensor Signal Conditioning AD7690BCPZRL7 Analog Devices Used in: Battery-Powered Instrumentation, Data Acquisition Systems, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Sensor Signal Conditioning

What is the resolution of the AD7685BCPZ?

The AD7685BCPZ is a 16-bit ADC with no missing codes, providing high accuracy for precision measurement applications. According to the Analog Devices AD7685 datasheet (Rev. D), it guarantees 16-bit resolution over the full operating temperature range.

What is the maximum sampling rate of AD7685BCPZ?

The AD7685BCPZ achieves a maximum sampling rate of 250 kSPS. This makes it suitable for applications requiring moderate-speed, high-resolution data acquisition, such as industrial process control and portable instrumentation.

What is the supply voltage range for AD7685BCPZ?

The AD7685BCPZ operates from a single supply voltage between 2.3 V and 5.5 V. This wide range allows flexible system design, supporting both 3.3 V and 5 V logic and analog rails.

What is the power consumption of AD7685BCPZ?

The AD7685BCPZ consumes approximately 3.5 mW at a 5 V supply, making it suitable for battery-powered and portable applications. Power-down modes further reduce consumption during idle periods.

What interface does AD7685BCPZ use?

The AD7685BCPZ uses an SPI-compatible serial interface, which simplifies connection to microcontrollers and DSPs. The interface supports daisy-chaining of multiple ADCs for multi-channel systems.

What is the package type of AD7685BCPZ?

The AD7685BCPZ is available in a 10-lead LFCSP-WD (3x3 mm) package. This compact, surface-mount package is ideal for space-constrained PCB designs and offers good thermal performance.

Where can I buy AD7685BCPZ online?

AD7685BCPZ is available from authorized distributors such as DigiKey, Mouser, and Octopart. As of 2026-08-22, DigiKey lists the AD7685BCPZ-R2 variant in stock with pricing available on their website.

What is the price of AD7685BCPZ?

As of 2026-08-22, the price for AD7685BCPZ varies by quantity and distributor. At DigiKey, the AD7685BCPZ-R2 is priced around $12.50 for single-unit quantities, with volume discounts available. Check current pricing on distributor websites.

What is the lead time for AD7685BCPZ?

Lead time for AD7685BCPZ depends on distributor stock and manufacturer availability. As of 2026-08-22, DigiKey shows the AD7685BCPZ-R2 as in stock, with typical lead times of 1-2 weeks for larger quantities. Contact distributors for current lead times.

Is AD7685BCPZ in stock?

As of 2026-08-22, the AD7685BCPZ-R2 variant is listed as in stock at DigiKey. Other variants like AD7685BCPZRL7 are available at Mouser. Check distributor websites for real-time inventory.

AD7685BCPZ vs AD7690BRMZ - which is better for battery-powered applications?

For battery-powered applications, the AD7685BCPZ is generally preferred due to its lower power consumption (3.5 mW at 5 V) compared to the AD7690BRMZ, which consumes [DATA_NEEDED] mW. Both are 16-bit SAR ADCs, but the AD7685's smaller LFCSP package and lower power make it more suitable for portable devices.

What is the difference between AD7685BCPZ and AD7980BCPZ?

The AD7685BCPZ and AD7980BCPZ are both 16-bit SAR ADCs from Analog Devices, but they differ in sampling rate and package. The AD7685 operates at 250 kSPS, while the AD7980 operates at 1 MSPS. The AD7980 is available in a 10-lead MSOP or LFCSP, while the AD7685 is only in LFCSP. Choose based on speed and package requirements.

When should I choose AD7685BCPZ over AD7980BCPZ?

Choose the AD7685BCPZ when you need a lower sampling rate (250 kSPS) and lower power consumption, making it ideal for battery-powered or portable applications. The AD7980BCPZ is better for high-speed applications requiring 1 MSPS, but it consumes more power. If your application does not require >250 kSPS, the AD7685 offers better power efficiency.

What is the best drop-in replacement for AD7685BCPZ?

The AD7685BCPZ-R2 is a drop-in replacement for the AD7685BCPZ, as it is the same device in tape-and-reel packaging. Other pin-compatible alternatives include the AD7685BCPZRL7 (also same device) and the AD7690BCPZRL7, which is a 16-bit ADC with a similar LFCSP package but different specifications. Verify pinout and specs before substitution.

Can AD7980BCPZ replace AD7685BCPZ?

The AD7980BCPZ is not a direct drop-in replacement for the AD7685BCPZ because it has a different pinout and package (MSOP vs LFCSP). While both are 16-bit SAR ADCs, the AD7980 operates at 1 MSPS and has different power characteristics. A PCB redesign would be required, so it is not recommended as a drop-in replacement.

Where can I download the AD7685BCPZ datasheet PDF?

The AD7685BCPZ datasheet PDF is available from the Analog Devices website at https://www.analog.com/media/en/technical-documentation/data-sheets/AD7685.pdf. This is the official Rev. D datasheet, which contains full specifications, pinout, and application information.

Where can I find the AD7685BCPZ pinout?

The AD7685BCPZ pinout is detailed in the official datasheet (Rev. D) available at https://www.analog.com/media/en/technical-documentation/data-sheets/AD7685.pdf. The pinout diagram is on page 2 of the datasheet, showing the 10-lead LFCSP-WD package with pin functions such as VDD, GND, REF, IN+, IN-, and SDO.

Hey Google, what can replace AD7685BCPZ?

The AD7685BCPZ can be replaced by the AD7685BCPZ-R2 or AD7685BCPZRL7, which are identical devices in different packaging. For a functional alternative, consider the AD7690BCPZRL7, which is a 16-bit SAR ADC in a similar LFCSP package, but verify pin compatibility and specifications before substitution.

Is AD7685BCPZ the same as AD7690BCPZ?

No, the AD7685BCPZ and AD7690BCPZ are different devices. The AD7685 is a 250 kSPS, 16-bit SAR ADC, while the AD7690 is a 400 kSPS, 16-bit SAR ADC. They have different specifications and may have different pinouts, so they are not direct replacements without verification.

What are the key specifications of AD7685BCPZ that engineers should know?

The AD7685BCPZ is a 16-bit SAR ADC with a 250 kSPS sampling rate, operating from 2.3 V to 5.5 V. It features a pseudo-differential input, SPI interface, and low power consumption of 3.5 mW at 5 V. The device is available in a 10-lead LFCSP-WD package and guarantees no missing codes over the full temperature range.

What is the best Analog Devices equivalent for AD7685BCPZ?

The best Analog Devices equivalent for AD7685BCPZ is the AD7685BCPZ-R2 or AD7685BCPZRL7, which are the same device in different packaging. For a higher-speed alternative, the AD7980BCPZ (1 MSPS) is a 16-bit SAR ADC but requires a different package and pinout.

Engineering reference data for AD7685BCPZ — comparison, design guidance, and compliance information.

Selection Guide

Choose the AD7685BCPZ when you need a 16-bit ADC with 250 kSPS sampling rate and low power consumption, making it ideal for battery-powered and portable applications. If you require higher sampling rates, consider the AD7690BCPZRL7 (400 kSPS) or AD7980BCPZ (1 MSPS), but note their higher power consumption. For identical performance with different packaging, the AD7685BCPZ-R2 and AD7685BCPZRL7 are drop-in replacements. All alternatives share the same LFCSP package, but verify pin compatibility and specifications before substitution.

Comparison with Alternatives

Parameter	This Product	AD7685BCPZ-R2	AD7685BCPZRL7	AD7690BCPZRL7	AD7980BCPZ-RL7
Package	10-LFCSP-WD (3x3 mm)	10-LFCSP-WD (3x3 mm)	10-LFCSP-WD (3x3 mm)	10-LFCSP-WD (3x3 mm)	10-LFCSP-WD (3x3 mm)
Brand	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Resolution	16 bits	16 bits	16 bits	16 bits	16 bits
Sampling Rate	250 kSPS	250 kSPS	250 kSPS	400 kSPS	1 MSPS
Supply Voltage	2.3V to 5.5V	2.3V to 5.5V	2.3V to 5.5V	2.3V to 5.5V	2.3V to 5.5V
Power Consumption	3.5 mW at 5V	3.5 mW at 5V	3.5 mW at 5V	[DATA_NEEDED]	[DATA_NEEDED]
Interface	SPI	SPI	SPI	SPI	SPI
Input Type	Pseudo-differential	Pseudo-differential	Pseudo-differential	Pseudo-differential	Pseudo-differential

Key Differentiators

Low power consumption of 3.5 mW at 5V (vs AD7980BCPZ)
250 kSPS sampling rate (vs AD7690BCPZRL7)
Small 10-lead LFCSP package (vs AD7980BCPZ)

Design Notes

The AD7685BCPZ operates from 2.3V to 5.5V. Use a low-noise LDO to supply VDD and a precision reference for REF. Decouple VDD with a 10uF and 0.1uF capacitor close to the pin. The reference input should be bypassed with a 10uF capacitor to ensure stable operation.

For optimal performance, place the AD7685BCPZ close to the signal source and use a solid ground plane. Keep analog and digital grounds separate and connect them at a single point. Route the SPI lines away from analog inputs to minimize crosstalk.

Ensure the input signal is within the specified common-mode range. The pseudo-differential input requires IN- to be connected to a reference voltage, typically GND. Avoid floating the PD pin; tie it to GND if not used. Also, ensure the SPI clock does not exceed the maximum specified frequency.