Analog Devices Inc. AD7652ASTZ

Overview

AD7652ASTZ from Analog Devices is a 16-bit, 500 kSPS charge redistribution SAR analog-to-digital converter operating from a single 5 V supply, featuring an internal 2.5 V reference (±7 ppm/°C drift), no pipeline delay, and dual parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interface. It delivers 86 dB SNR and 98 dB SFDR at 100 kHz input, targeting precision data acquisition in instrumentation and medical instruments.

For engineers reviewing the AD7652ASTZ datasheet, AD7652ASTZ pinout, AD7652ASTZ application, or AD7652ASTZ equivalent, key selection considerations include unipolar 0 V to 2.5 V input range, 2 µs conversion cycle time, 65 mW typical power dissipation at full throughput, and compatibility with both 3 V and 5 V logic interfaces.

Technical Context

The AD7652ASTZ implements a high-speed charge redistribution SAR architecture with integrated error correction circuitry, eliminating pipeline latency and enabling immediate data availability post-conversion. Its internal reference provides 2.48 V to 2.52 V output at 25°C with ±7 ppm/°C temperature drift over –40°C to +85°C.

It supports three digital interface modes: parallel (16-bit bus with RD/CS/BUSY control), serial master (internal SCLK generation), and serial slave (external SCLK synchronization), all compatible with 3 V or 5 V OVDD. Conversion is initiated by CNVST falling edge, with BUSY signaling completion and data readiness.

Key Specifications

Pinout & Package

The AD7652ASTZ is housed in a 48-lead LQFP package (ST-48 footprint), with exposed pad for thermal management and specified operation from –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7652ASTZ, AD7654ASTZ adds dual-channel simultaneity at lower speed and identical packaging, while ADS8860IDRCT trades internal reference and parallel interface for smaller size and higher throughput-making AD7652ASTZ optimal for single-channel, reference-integrated, interface-flexible industrial DAQ.

Availability

AD7652ASTZ is available at Aetrix Electronics and suitable for data acquisition, medical instrumentation, and industrial process control requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7652ASTZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7652ASTZ belongs to the PulSAR® family of precision SAR ADCs, engineered for high-speed, low-latency, and low-power data acquisition in demanding industrial and medical applications.

FAQ

What is the maximum sample rate of the AD7652ASTZ?

The AD7652ASTZ achieves a maximum throughput rate of 500 kSPS, completing each full conversion cycle in 2 µs. This is confirmed in the Absolute Maximum Ratings and Timing Specifications sections of the official datasheet, with t2 (time between conversions) specified at 2 µs minimum. The AD7652ASTZ maintains this rate across its full operating temperature range of –40°C to +85°C when powered from AVDD = DVDD = 5 V.

Does the AD7652ASTZ require an external reference voltage?

No, the AD7652ASTZ includes an internal 2.5 V reference with ±7 ppm/°C temperature drift, making it fully functional without external reference components. However, PDREF must be driven LOW to enable the internal reference, and PDBUF should be LOW to activate the internal buffer. External references (2.3 V to AVDD – 1.85 V) may be used by setting PDREF HIGH, but the AD7652ASTZ's internal reference is sufficient for most precision unipolar applications.

What digital interfaces does the AD7652ASTZ support?

The AD7652ASTZ supports both parallel and serial digital interfaces via the SER/PAR pin. In parallel mode (SER/PAR = LOW), it uses a 16-bit bidirectional data bus with RD, CS, and BUSY control signals. In serial mode (SER/PAR = HIGH), it operates as SPI/QSPI/MICROWIRE/DSP-compatible master or slave, using SDOUT, SYNC, SCLK, and SDIN pins. Both modes support 3 V or 5 V OVDD logic levels.

What is the analog input voltage range for the AD7652ASTZ?

The AD7652ASTZ accepts a unipolar analog input voltage range of 0 V to 2.5 V, referenced to INGND. The absolute maximum ratings allow VIN up to +3 V and INGND up to +0.5 V, but specified performance (including linearity and accuracy) is guaranteed only within the 0 V to 2.5 V range when using the internal reference. Input impedance is 1.2 MΩ typical at 500 kSPS.

How does power consumption scale with throughput on the AD7652ASTZ?

Power consumption of the AD7652ASTZ scales dynamically with throughput: it draws 65 mW typical at 500 kSPS (with internal reference disabled) and drops to just 130 µW at 1 kSPS. This behavior is documented in Figure 15 of the datasheet and results from adaptive clocking and power-gating circuitry. With internal reference enabled, total dissipation rises to 80 mW at full speed, remaining proportional to sample rate.