Analog Devices

AD7688BCPZ - 16-Bit 500kSPS PulSAR ADC | Analog Devices

Name: AD7688BCPZ
Brand: Analog Devices
Price: 14.21 USD
Availability: InStock

MPN: AD7688BCPZ ✓ Active

In Stock Ships in 1-3 business days

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

From $14.21 USD / Unit

MOQ: 1 |

Price updated: 2026-08-22

Volume Pricing

Qty	Unit Price	Extended
1	$23.69	$23.69
10	$21.32	$213.20
100	$18.95	$1,895.00
500	$16.58	$8,290.00
1,000	$14.21	$14,210.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for AD7688BCPZ — 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:

AD7688BCPZ-R2

✅ Drop-In

📦 10-Lead LFCSP-WD (3x3 mm)

Same die and package, tape-and-reel packaging variant

📋 Reference alternative (not in catalog)

AD7980BCPZ-RL7

✅ Drop-In

Analog Devices

📦 10-Lead 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 →

AD7690BCPZRL7

✅ Drop-In

Analog Devices

📦 10-Lead 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

View Datasheet →

ℹ️ 3 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

AD7688BCPZ Maximum Ratings & Electrical Characteristics

Resolution	16 bits
Sampling Rate	500 kSPS
Input Type	Differential
INL (Typ)	±0.4 LSB
INL (Max)	±1.5 LSB (±23 ppm of FSR)
SNR	95.5 dB @ 20 kHz
THD	-118 dB @ 20 kHz
Dynamic Range	96.5 dB
Supply Voltage (VDD)	4.5 V to 5.5 V
Logic Supply Voltage (VIO)	2.3 V to 5.5 V
Operating Temperature Range	-40°C to +85°C
Package	10-Lead LFCSP-WD (3x3 mm)
Interface	SPI
RoHS Status	Compliant
Lead-Free	Yes

AD7688BCPZ Pin Configuration

Pin 1	IN+ — Positive differential analog input
Pin 2	IN- — Negative differential analog input
Pin 3	GND — Ground
Pin 4	VDD — Analog power supply (4.5V to 5.5V)
Pin 5	VIO — Logic power supply (2.3V to 5.5V)
Pin 6	SCK — Serial clock input
Pin 7	SDI — Serial data input (for configuration)
Pin 8	SDO — Serial data output
Pin 9	CNV — Convert input (start conversion)
Pin 10	REF — Reference voltage input

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

AD7688BCPZ is suitable for 6 applications: High-Speed Data Acquisition, Medical Imaging, Industrial Process Control, Portable Instrumentation, Test and Measurement, Audio Test Equipment.

🖥️

High-Speed Data Acquisition

The AD7688BCPZ's 500 kSPS sampling rate and 16-bit resolution make it ideal for high-speed data acquisition systems. Its true differential input rejects common-mode noise, ensuring accurate capture of fast-changing signals. The SPI interface allows easy integration with microcontrollers and DSPs, enabling real-time processing in applications like vibration analysis and transient recording.

Recommended

AD7980BCPZ (Higher-speed alternative for faster sampling) AD7690BCPZ (Lower-speed alternative for power savings)

💊

Medical Imaging

In medical imaging systems such as ultrasound and MRI, the AD7688BCPZ provides high-resolution digitization of analog sensor signals. Its 95.5 dB SNR and -118 dB THD ensure minimal distortion, preserving image quality. The small LFCSP package fits compact probes, and the low power consumption extends battery life in portable devices. The differential input helps reject interference from other medical equipment.

Recommended

AD7980BCPZ (Faster ADC for high-frame-rate imaging) ADR4550 (Low-noise voltage reference for accurate conversions)

🏭

Industrial Process Control

The AD7688BCPZ is well-suited for industrial process control, where precise measurement of temperature, pressure, and flow is critical. Its 16-bit resolution and ±1.5 LSB max INL ensure accurate readings, while the wide operating temperature range (-40°C to +85°C) allows deployment in harsh factory environments. The SPI interface simplifies connection to PLCs and industrial microcontrollers, and the differential input rejects common-mode noise from long sensor leads.

Recommended

AD7690BCPZ (Lower-speed alternative for power-sensitive loops) AD7980BCPZ (Higher-speed alternative for fast control loops)

📱

Portable Instrumentation

For battery-powered portable instruments like handheld multimeters and data loggers, the AD7688BCPZ offers a balance of performance and power efficiency. Its low power consumption extends battery life, while the 3x3 mm LFCSP package minimizes PCB area. The device operates from a single 5V supply, simplifying power design. The SPI interface supports low-voltage logic (2.3V), enabling direct connection to low-power microcontrollers.

Recommended

AD7980BCPZ (Higher-speed option for dynamic measurements) AD7690BCPZ (Lower-speed option for longer battery life)

🔧

Test and Measurement

In test and measurement equipment such as spectrum analyzers and oscilloscopes, the AD7688BCPZ provides high-speed, high-resolution digitization of input signals. Its 500 kSPS throughput and 16-bit resolution enable accurate capture of waveforms and spectral content. The true differential input allows direct connection to balanced sources, reducing noise. The small package and SPI interface facilitate compact, multi-channel designs.

Recommended

AD7980BCPZ (Faster ADC for higher bandwidth measurements) AD7690BCPZ (Lower-speed ADC for lower noise floor)

🎧

Audio Test Equipment

The AD7688BCPZ is used in audio test equipment for measuring THD and SNR of audio systems. Its -118 dB THD and 95.5 dB SNR ensure accurate characterization of audio components. The differential input interfaces directly with balanced audio outputs, and the high sampling rate supports analysis up to 250 kHz. The device's low power consumption is beneficial for portable audio analyzers.

Recommended

AD7980BCPZ (Higher-speed ADC for wider bandwidth analysis) AD7690BCPZ (Lower-speed ADC for lower noise measurements)

Recommended Products Summary

AD7980BCPZ Higher-speed alternative for faster sampling Used in: High-Speed Data Acquisition, Medical Imaging, Industrial Process Control, Portable Instrumentation, Test and Measurement, Audio Test Equipment AD7690BCPZ Lower-speed alternative for power savings Used in: High-Speed Data Acquisition, Industrial Process Control, Portable Instrumentation, Test and Measurement, Audio Test Equipment ADR4550 Low-noise voltage reference for accurate conversions Used in: Medical Imaging

What is the resolution and sampling rate of AD7688BCPZ?

The AD7688BCPZ is a 16-bit SAR ADC with a maximum sampling rate of 500 kSPS. According to the Analog Devices datasheet (Rev. B), it provides 16-bit resolution with no missing codes, making it suitable for high-speed, high-precision data acquisition applications.

What is the input type of AD7688BCPZ?

The AD7688BCPZ features a true differential analog input, which allows it to reject common-mode noise and improve dynamic performance. The differential input range can be configured for unipolar or bipolar operation, as detailed in the AD7688 datasheet.

What is the INL performance of AD7688BCPZ?

The AD7688BCPZ has a typical INL of ±0.4 LSB and a maximum INL of ±1.5 LSB (±23 ppm of FSR). This excellent linearity ensures accurate conversion results, as specified in the Analog Devices AD7688 datasheet.

What is the SNR and THD of AD7688BCPZ?

The AD7688BCPZ achieves an SNR of 95.5 dB and a THD of -118 dB at a 20 kHz input frequency. These specifications, from the AD7688 datasheet, indicate high signal fidelity and low distortion, making it ideal for precision measurement systems.

What is the supply voltage range for AD7688BCPZ?

The AD7688BCPZ operates with an analog supply voltage (VDD) of 4.5 V to 5.5 V and a logic supply voltage (VIO) of 2.3 V to 5.5 V. This flexibility allows interfacing with various digital logic levels, as stated in the datasheet.

What is the package type of AD7688BCPZ?

The AD7688BCPZ is housed in a 10-lead LFCSP-WD (lead frame chip scale package) with dimensions of 3x3 mm. This compact package is suitable for space-constrained designs, as noted in the AD7688 product page.

What is the operating temperature range of AD7688BCPZ?

The AD7688BCPZ is specified for operation over the industrial temperature range of -40°C to +85°C. This wide range ensures reliable performance in demanding environments, as per the AD7688 datasheet.

What is the interface of AD7688BCPZ?

The AD7688BCPZ uses a serial peripheral interface (SPI) for communication, supporting clock speeds up to 50 MHz. This high-speed interface enables efficient data transfer, as described in the AD7688 datasheet.

Is AD7688BCPZ RoHS compliant?

Yes, the AD7688BCPZ is RoHS compliant and lead-free. This is confirmed by the Analog Devices product page and the 'CPZ' suffix, which indicates a lead-free package.

What is the price of AD7688BCPZ?

As of 2026-08-22, the 1ku list price for AD7688BCPZ is $23.69, according to the Analog Devices product page. Actual pricing may vary by distributor and quantity.

Where can I buy AD7688BCPZ?

AD7688BCPZ is available from authorized distributors such as DigiKey, Mouser, and Analog Devices directly. As of 2026-08-22, it is in stock at major distributors; check their websites for current availability and pricing.

What is the lead time for AD7688BCPZ?

The typical lead time for AD7688BCPZ is 4-6 weeks from Analog Devices, but it may vary depending on stock levels at distributors. As of 2026-08-22, DigiKey lists it as 'ships today' for the -R2 variant, indicating immediate availability.

What is the difference between AD7688BCPZ and AD7682BCPZ?

The AD7688BCPZ is a single-channel 16-bit 500 kSPS ADC, while the AD7682BCPZ is a 4-channel 16-bit 250 kSPS ADC. Both use the PulSAR architecture, but the AD7688 offers higher speed and a differential input, whereas the AD7682 provides multiplexed inputs. Choose based on channel count and speed requirements.

Can AD7688BCPZ be used in medical imaging applications?

Yes, the AD7688BCPZ is suitable for medical imaging due to its high resolution (16-bit), high speed (500 kSPS), and low noise (SNR 95.5 dB). These features enable accurate digitization of analog signals in ultrasound and MRI systems, as noted in the datasheet's application section.

What is the best drop-in replacement for AD7688BCPZ?

The AD7688BCPZ-R2 is a direct drop-in replacement with the same package and specifications, differing only in tape-and-reel packaging. For a cross-brand alternative, the AD7980BCPZ (also from Analog Devices) is pin-compatible and offers similar performance, but verify the pinout before use.

Engineering reference data for AD7688BCPZ — comparison, design guidance, and compliance information.

Selection Guide

Choose the AD7688BCPZ when you need a high-speed (500 kSPS), high-resolution (16-bit) ADC with a true differential input in a compact 3x3 mm package. It is ideal for applications requiring excellent AC performance, such as medical imaging and audio test equipment. If you need higher speed (1 MSPS), consider the AD7980BCPZ, but note its higher power consumption. For lower speed (400 kSPS) and lower power, the AD7690BCPZ is a suitable alternative. If you require multiple input channels, the AD7682BCPZ (4-channel) or AD7689BCPZ (8-channel) are better options, but they have a larger package and lower speed. For a drop-in replacement with identical specifications, the AD7688BCPZ-R2 is the direct choice.

Comparison with Alternatives

Parameter	This Product	AD7688BCPZ-R2	AD7980BCPZ	AD7690BCPZ
Package	10-Lead LFCSP-WD (3x3 mm)	10-Lead LFCSP-WD (3x3 mm)	10-Lead LFCSP-WD (3x3 mm)	10-Lead LFCSP-WD (3x3 mm)
Brand	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Resolution	16 bits	16 bits	16 bits	16 bits
Sampling Rate	500 kSPS	500 kSPS	1 MSPS	400 kSPS
Input Type	Differential	Differential	Differential	Differential
INL (Max)	±1.5 LSB	±1.5 LSB	±1.5 LSB	±1.5 LSB
SNR	95.5 dB	95.5 dB	95.5 dB	95.5 dB
Supply Voltage (VDD)	4.5V to 5.5V	4.5V to 5.5V	2.3V to 5.5V	2.3V to 5.5V

Key Differentiators

Higher sampling rate than AD7690BCPZ (vs AD7690BCPZ)
Lower power consumption than AD7980BCPZ (vs AD7980BCPZ)
True differential input (vs AD7682BCPZ)

Design Notes

Decouple the VDD and VIO pins with 0.1 µF and 10 µF capacitors placed as close to the pins as possible. Use a low-noise LDO for the analog supply to minimize noise coupling into the ADC. The reference input (REF) should be driven by a low-impedance source, such as the ADR4550, with a 10 µF decoupling capacitor to ensure stable operation.

For optimal performance, use a solid ground plane under the ADC and route analog and digital signals separately. Keep the analog input traces short and shielded to reduce noise pickup. The LFCSP package has an exposed pad; solder it to the ground plane for improved thermal and electrical performance.

Avoid driving the analog inputs beyond the supply rails, as this can cause latch-up or damage. Ensure the reference voltage is within the specified range (typically 2.5V to VDD) and is stable during conversion. The SPI interface should be operated within the specified clock frequency (up to 50 MHz) to avoid timing errors.