AD7606BSTZ Datasheet, Pinout & Buy: 16-Bit 8-Channel Simultaneous-Sampling ADC

The AD7606BSTZ is Analog Devices’ 16-bit, 8-channel simultaneous-sampling data-acquisition ADC in a 64-lead LQFP, built for three-phase power metering and multi-channel instrumentation. It samples all eight channels at the same instant at up to 200 kSPS, accepts true bipolar +/-10 V or +/-5 V inputs on a single 5 V supply, and needs no external driver op-amps. This page covers the datasheet specs, the pinout and interface options, drop-in alternatives, and how to source the part without counterfeits.

AD7606BSTZ Key Specs at a Glance

• Resolution / channels: 16-bit, 8 simultaneous channels (charge-redistribution SAR)
• Throughput: up to 200 kSPS per channel, all eight sampled at once
• Input range: true bipolar +/-10 V or +/-5 V (set by the RANGE pin); 1 MΩ input impedance
• Supply: single 5 V analog (AVCC 4.75-5.25 V); VDRIVE 2.3-5.25 V for logic
• On-chip: 2nd-order antialiasing filter, track-and-hold, 2.5 V reference, digital filter with oversampling x2 to x64
• Interfaces: parallel, high-speed serial (SPI/QSPI/DSP), and parallel-byte
• Protection / package: input clamp to +/-16.5 V; 64-lead LQFP (the BSTZ suffix is the RoHS, tray-packed option)

What Is the AD7606BSTZ?

The AD7606BSTZ is not just an ADC – it’s a complete analog front end. Each of the eight channels carries clamp protection, an analog antialiasing filter, and a track-and-hold ahead of a shared 16-bit SAR core, with a 2.5 V reference and reference buffer built in. Because the input impedance is a flat 1 MΩ regardless of sample rate, you can often drive the inputs directly from a resistor-divided sensor without a buffer amplifier, which removes a row of op-amps and a bipolar supply from your bill of materials.

The word that matters here is simultaneous. All eight track-and-holds capture at the same instant on the rising edge of CONVST, so the relative phase between channels is preserved. In a three-phase meter that is the whole game: if voltage and current were sampled sequentially, the phase lag would corrupt the power-factor and harmonic calculations. The end of conversion is flagged by the falling edge of the BUSY pin.

On the part number itself: in the AD7606 family the ST denotes the 64-lead LQFP and the Z denotes a RoHS, lead-free package. AD7606BSTZ ships in trays; AD7606BSTZ-RL is the same silicon on tape and reel for automated placement. The -4 and -6 members (AD7606-4, AD7606-6) are the four- and six-channel versions.

AD7606BSTZ Specifications (Datasheet Summary)

Parameter	AD7606BSTZ
Resolution	16-bit, no missing codes
Channels	8, simultaneously sampled
Max throughput	200 kSPS per channel (all channels)
Analog input	True bipolar +/-10 V or +/-5 V (RANGE pin)
Input impedance	1 MΩ (independent of sample rate)
Input clamp protection	Up to +/-16.5 V (series-limit current above this)
Analog supply (AVCC)	4.75 V to 5.25 V (single 5 V)
Logic supply (VDRIVE)	2.3 V to 5.25 V
Reference	Internal 2.5 V (or external)
Oversampling	Digital filter, OS x2 to x64 (hardware mode)
Output coding	Twos complement
Interfaces	Parallel, serial (SPI/QSPI/DSP), parallel-byte
Package	64-lead LQFP (BSTZ); operating -40 C to +85 C

For reference, the LSB size scales with range: about 305 uV on the +/-10 V range and 153 uV on the +/-5 V range. Oversampling trades throughput for resolution and noise rejection – useful when your channels run well below 200 kSPS.

AD7606BSTZ Pinout and Interface Options

The 64-lead LQFP groups its pins into analog inputs, conversion control, the digital data bus, and supplies. Rather than memorize all 64, work by function:

Pin group	Function
V1 to V8	Eight analog inputs (high-impedance, bipolar)
REFIN/REFOUT, REGCAP	2.5 V reference in/out and regulator decoupling
CONVST A / CONVST B	Conversion start; tie together for all-channel simultaneous sampling, or split for two groups
BUSY	High during conversion; falling edge = data ready
CS, RD/SCLK	Frame and clock the read (parallel or serial)
RESET	Reset input; a ~100 ns pulse is required after power-up
RANGE	Selects +/-10 V (high) or +/-5 V (low)
OS0 / OS1 / OS2	Oversampling-ratio select pins
PAR/SER/BYTE SEL, DB15/BYTE SEL	Choose parallel, serial, or byte interface
DB0 to DB15	Parallel data bus (DB7 doubles as DOUTA, DB8 as DOUTB in serial mode)
FRSTDATA	Flags when channel V1 is on the output
AVCC, VDRIVE, AGND, DGND	Analog/logic supplies and grounds

Pick the interface to match your controller: the parallel bus gives maximum throughput with an FPGA, while the serial interface is the natural fit for an STM32 or similar MCU. The interface is selected with the PAR/SER/BYTE SEL pins.

AD7606 Conversion Timing and Oversampling Explained

A read cycle is simple once you see the handshake. Pulse CONVST A and CONVST B high together and every channel’s track-and-hold freezes at that instant; BUSY goes high while the SAR core digitizes all eight results using the on-chip oscillator. When BUSY falls, the results are latched and ready, and you clock them out over the parallel or serial bus. FRSTDATA marks when channel V1 appears on the output so you can align the stream.

Oversampling is the AD7606’s quiet superpower. Set OS0-OS2 for a ratio from x2 to x64 and the on-chip digital filter averages multiple internal conversions per output sample. You give up throughput – the effective output rate drops as the ratio rises – but you gain effective resolution and strong rejection of out-of-band noise, often removing the need for a steep external antialiasing filter. For a meter sampling at a few kSPS, a high oversampling ratio is essentially free performance.

One subtlety that bites first-time users: data read back while BUSY is still high costs about 1.5 dB of SNR. If you are chasing the part’s full noise performance, finish the read after BUSY falls rather than overlapping it with the next conversion. The trade-off is latency versus noise, and for most measurement loops the cleaner read is worth the few extra microseconds.

AD7606BSTZ Applications

The AD7606 family is the industry workhorse for multi-channel simultaneous sampling. Typical designs include three-phase power and energy metering, power-line and grid monitoring, protective relays, multi-axis motor and servo control, vibration and condition monitoring, and general data acquisition. These boards are exactly the kind of industrial PCB and power supply PCB work where simultaneous capture and clean grounding decide whether the measurement is trustworthy.

AD7606BSTZ vs ADS8588S vs AD7606B/AD7606C (Alternatives & Cross-Reference)

If you are second-sourcing or hunting for a drop-in, three options come up most often. The TI ADS8588S is a pin-to-pin-compatible alternative that many teams qualify as a second source to de-risk allocation. Within ADI’s own line, the AD7606B and AD7606C-16 are the modern upgrades – faster, with software-configurable ranges and on-chip diagnostics.

Device	Resolution	Max throughput	Input ranges	Notes
AD7606 (BSTZ)	16-bit	200 kSPS/ch	+/-10 V, +/-5 V	The classic; hardware mode
AD7606B	16-bit	800 kSPS/ch	+/-10/5/2.5 V	Adds software mode, calibration, diagnostics
AD7606C-16	16-bit	1 MSPS/ch	Many, per-channel	Per-channel PGA, +/-21 V clamp
TI ADS8588S	16-bit	200 kSPS/ch	+/-10 V, +/-5 V	Pin-to-pin second source

A word of caution on “compatible.” A pin-compatible second source like the ADS8588S protects your supply chain, but timing, oversampling behavior, and noise differ in the details – confirm them against both datasheets before you assume a true drop-in. The same applies to the inexpensive AD7606 modules sold online: many are genuine, some are built on re-marked or recycled parts, so treat open-market module stock as unverified until inspected.

How to Buy the AD7606BSTZ (and Avoid Counterfeits)

The AD7606BSTZ is an active part, but multi-channel ADCs go on allocation periodically, and when authorized stock dries up the open market fills with re-marked and recycled units. Order tray-packed AD7606BSTZ or reel-packed AD7606BSTZ-RL to match your line, insist on full lot and date-code traceability, and verify open-market lots before they reach the board. Our components sourcing team locates allocated and hard-to-find ADCs and verifies authenticity, and because the 64-lead LQFP is a 0.5 mm-pitch fine-pitch part, the same team can handle SMT assembly so sourcing and placement stay under one roof.

AD7606BSTZ Design and Assembly Mistakes to Avoid

• Letting AGND and DGND drift more than 0.3 V apart – the datasheet limit. Tie the grounds at a single point or plane.
• Skipping the power-up RESET. The AD7606 needs a RESET pulse (about 100 ns) after supplies settle, or the first conversions are invalid.
• Driving inputs above +/-16.5 V without a series resistor. The clamp protects the part, but you must limit the current to about +/-10 mA.
• Reading while BUSY is high. Reading during a conversion reduces SNR by roughly 1.5 dB – time reads after BUSY falls.
• Hand-soldering the LQFP-64. At 0.5 mm pitch, use a stencil and reflow to IPC-A-610 Class 2 or 3; hand work invites bridges and opens.
• Thin decoupling. Follow the datasheet’s AVCC, VDRIVE, and REGCAP decoupling, and keep the 2.5 V reference quiet.

Frequently Asked Questions About the AD7606BSTZ

What is the difference between AD7606BSTZ and AD7606BSTZ-RL?

None electrically. Both are the same 64-lead LQFP silicon. AD7606BSTZ is tray-packed; AD7606BSTZ-RL is tape-and-reel for pick-and-place. Pick the packaging that matches your assembly process.

Is the AD7606 obsolete?

No. The AD7606/BSTZ is active. ADI also offers the faster AD7606B and AD7606C-16 with extra ranges and diagnostics as recommended upgrades, but the original remains in production and widely used.

What is a pin-compatible alternative to the AD7606?

The Texas Instruments ADS8588S is the common pin-to-pin alternative used as a second source. Verify timing and oversampling differences against both datasheets before treating it as a true drop-in.

What is the AD7606 sampling rate?

Up to 200 kSPS on every channel, with all eight channels sampled simultaneously. Using oversampling lowers the effective output rate in exchange for better noise performance.

Can I sample more than eight channels?

Yes. Multiple AD7606 devices can share a parallel data bus and be triggered together, letting you expand a simultaneous-sampling system well beyond eight channels.

Does the AD7606 need external op-amps?

Usually not. The 1 MΩ input impedance, on-chip antialiasing filter, and track-and-hold let many designs drive the inputs directly on a single 5 V supply, removing external driver amplifiers and bipolar rails.

What does oversampling do on the AD7606?

Oversampling (OS x2 to x64) averages several internal conversions per output sample using the on-chip digital filter. It lowers the output data rate but improves effective resolution and rejects out-of-band noise, often replacing a steep external antialiasing filter.

How do I connect the AD7606 to an FPGA or MCU?

Use the parallel interface with an FPGA for maximum throughput, or the serial (SPI-compatible) interface with an MCU such as an STM32. Select the mode with the PAR/SER/BYTE SEL pins, trigger conversion with CONVST, and read after BUSY falls.

Sourcing the AD7606BSTZ for Your Next Build

The AD7606BSTZ earns its place wherever phase-accurate, multi-channel measurement matters – and the design only succeeds if the part is genuine and the LQFP is placed cleanly. Send us your part list or full BOM and we’ll confirm AD7606BSTZ availability, verify authenticity, and quote the assembled board in one pass.