Analog Devices Inc. AD7492BR-REEL7

Overview

AD7492BR-REEL7 from Analog Devices is a 12-bit, 1.25 MSPS successive approximation ADC with integrated 2.5 V reference and on-chip clock oscillator. It operates from a single 2.7 V to 5.25 V supply, delivers 70 dB typical SNR at 100 kHz input, and features no pipeline delay for deterministic timing in real-time control loops.

For engineers reviewing the AD7492BR-REEL7 datasheet, AD7492BR-REEL7 pinout, AD7492BR-REEL7 application, or AD7492BR-REEL7 equivalent, this page provides verified technical context, parallel interface timing constraints, sleep-mode power management trade-offs, and validated alternative options for high-speed data acquisition systems.

Technical Context

The AD7492BR-REEL7 implements a capacitive DAC-based SAR architecture with track/hold bandwidth up to 10 MHz. Conversion is triggered by the falling edge of CONVST, and BUSY asserts for 680 ns (max) before going low to signal completion - enabling precise synchronization without latency uncertainty.

It supports dual sleep modes selected via PS/FS: partial sleep (250 μA typ) retains internal reference and oscillator, while full sleep (200 nA typ) powers down all analog circuitry. VDRIVE independently sets digital I/O voltage levels (2.7 V to 5.25 V), allowing 5 V analog performance with 3 V logic interfacing.

Key Specifications

Pinout & Package

AD7492BR-REEL7 is housed in a 24-lead SOIC package (body width 7.5 mm), RoHS-compliant and tape-and-reel packaged (REEL7 = 1000-piece reel). Pin layout supports standard PCB layout practices with separate AGND/DGND planes and decoupling requirements per Analog Devices' layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit high-speed ADC applications.

Compared with AD7492BR-REEL7, AD7492BRZ offers identical performance in non-reel form, while ADS7822U trades speed and integration for serial interface flexibility and smaller footprint - neither is pin-compatible, but both serve overlapping medium-precision acquisition roles.

Availability

AD7492BR-REEL7 is available at Aetrix Electronics and suitable for industrial motor control, portable medical instrumentation, laser ranging systems, and automotive battery monitoring requiring stable component supply and long-term manufacturability.

Supply support for AD7492BR-REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7492 product line targets high-speed, low-power data acquisition in space- and power-constrained systems - emphasizing integration (ref + clock), deterministic timing, and flexible voltage interfacing for industrial, medical, and test equipment.

FAQ

What is the maximum sampling rate supported by the AD7492BR-REEL7?

The AD7492BR-REEL7 supports a maximum throughput rate of 1.25 MSPS, corresponding to a conversion time of 680 ns and acquisition time of 120 ns. This rate is specified under VDD = 4.75 V to 5.25 V and TA = −40°C to +85°C. At lower supply voltages (e.g., 3 V), the maximum rate remains 1.25 MSPS but power dissipation drops to 4 mW typical - confirmed in Table 1 of the AD7492 Rev. A datasheet.

Does the AD7492BR-REEL7 require an external reference voltage?

No, the AD7492BR-REEL7 includes a 2.5 V ±1.5% internal reference that is fully functional and available on the REF OUT pin. This reference can be used directly for the ADC's conversion or supplied to external circuitry. An external reference may be applied to the REF IN pin only if the internal reference is disabled - but the AD7492BR-REEL7 does not expose REF IN; its reference is fixed and internal-only per the functional block diagram and pin description.

How does the PS/FS pin affect power consumption in the AD7492BR-REEL7?

The PS/FS pin selects between two hardware-defined sleep modes in the AD7492BR-REEL7: tying it high enables partial sleep (250 μA max), retaining internal reference and oscillator; tying it low enables full sleep (1 μA max, 200 nA typical), powering down all analog blocks. Wake-up time differs - 203 μs for partial, 500 μs for full sleep - and is triggered by the next rising edge of CONVST, as specified in Table 3.

Can the AD7492BR-REEL7 interface directly with a 3.3 V microcontroller?

Yes, the AD7492BR-REEL7 supports direct 3.3 V logic interfacing via the VDRIVE pin. When VDRIVE = 3.3 V, digital inputs (CS, RD, CONVST, PS/FS) recognize 2.31 V as VIH min and 0.99 V as VIL max, while outputs (DB0–DB11, BUSY) swing to 3.1 V min (VOH) and 0.4 V max (VOL). AVDD and DVDD may remain at 5 V to preserve analog performance - confirmed in Tables 1 and 2 under "Logic Inputs" and "Logic Outputs" sections.

Is the AD7492BR-REEL7 pin-compatible with other variants like AD7492-5 or AD7492-4?

Yes, the AD7492BR-REEL7 is functionally and physically pin-compatible with AD7492-5 and AD7492-4 - all share identical 24-lead SOIC/TSSOP pinouts, register maps, and interface protocols. The suffix denotes speed grade: AD7492BR-REEL7 is the AD7492-5 variant (1.25 MSPS), differing only in guaranteed conversion time (680 ns vs. 880 ns for AD7492) and associated AC specs - per Ordering Guide and Table 1 in Rev. A datasheet.