16-Bit, 500 kSPS PulSAR Dual,

2-Channel, Simultaneous Sampling ADC

Data Sheet

AD7654

Rev. D

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FEATURES

Dual, 16-bit, 2-channel simultaneous sampling ADC

16-bit resolution with no missing codes

Throughput:

500 kSPS (normal mode)

444 kSPS (impulse mode)

INL: ±3.5 LSB max (±0.0053% of full scale)

SNR: 89 dB typ at 100 kHz

THD: −100 dB at +100 kHz

Analog input voltage range: 0 V to 5 V

No pipeline delay

Parallel and serial 5 V/3 V interface

SPI®/QSPI™/MICROWIRE™/DSP compatible

Single 5 V supply operation

Power dissipation:

120 mW typical

2.6 mW at 10 kSPS

Packages:

48-lead low profile quad flat package (LQFP)

48-lead lead frame chip scale package (LFCSP)

Low cost

APPLICATIONS

AC motor control

3-phase power control

4-channel data acquisition

Uninterrupted power supplies

Communications

GENERAL DESCRIPTION

The AD7654 is a low cost, simultaneous sampling, dual-channel,

16-bit, charge redistribution SAR, analog-to-digital converter

that operates from a single 5 V power supply. It contains two

low noise, wide bandwidth, track-and-hold amplifiers that allow

simultaneous sampling, a high speed 16-bit sampling ADC, an

internal conversion clock, error correction circuits, and both

serial and parallel system interface ports. Each track-and-hold

has a multiplexer in front to provide a 4-channel input ADC.

The A0 multiplexer control input allows the choice of

simultaneously sampling input pairs INA1/INB1 (A0 = low) or

INA2/INB2 (A0 = high). The part features a very high sampling

rate mode (normal) and, for low power applications, a reduced

power mode (impulse) where the power is scaled with the

throughput. Operation is specified from −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

A/B

16

D[15:0]

BUSY

CS

SER/PAR

OGND

OVDD

DGND

DVDD

SERIAL

PORT

BYTESWAP

RD

AVDD AGND

REFx

REFGND

PD

RESET

CNVST

INAN

SWITCHED

CAP DAC

AD7654

INA1

IMPULSE

MUX

EOC

INA2

A0

INB1

INBN

INB2

TRACK/HOLD

×2

PARALLEL

INTERFACE

CLOCK

MUX

MUX

Figure 1.

Table 1. PulSAR® Selection

Type/kSPS

100 to 250

500 to 570

800 to 1000

>1000

Pseudo Differential

AD7660/

AD7661

AD7650/

AD7652

AD7653

AD7664/

AD7666

AD7667

True Bipolar

AD7663

AD7665

AD7671

True Differential

AD7675

AD7676

AD7677

AD7621

AD7623

18-Bit

AD7678

AD7679

AD7674

AD7641

Multichannel/

Simultaneous

AD7654

AD7655

PRODUCT HIGHLIGHTS

1.

Simultaneous Sampling.

The AD7654 features two sample-and-hold circuits that

allow simultaneous sampling. It provides inputs for four

channels.

2.

Fast Throughput.

The AD7654 is a 500 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

3.

Superior INL and No Missing Codes.

The AD7654 has a maximum integral nonlinearity of

3.5 LSB with no missing 16-bit codes.

4.

Single-Supply Operation.

The AD7654 operates from a single 5 V supply. In impulse

mode, its power dissipation decreases with throughput.

5.

Serial or Parallel Interface.

Versatile parallel or 2-wire serial interface arrangement is

compatible with both 3 V and 5 V logic.