16-Bit, 500 kSPS PulSAR

ADC in MSOP

Data Sheet

AD7686

FEATURES

16-bit resolution with no missing codes

Throughput: 500 kSPS

INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)

SINAD: 92.5 dB at 20 kHz

THD: −110 dB at 20 kHz

Pseudo differential analog input range

No pipeline delay

Single-supply 5 V operation with

1.8 V/2.5 V/3 V/5 V logic interface

Proprietary serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP-

compatible

Daisy-chain multiple ADCs and busy indicator

Power dissipation

3.75 µW at 5 V/100 SPS

3.75 mW at 5 V/100 kSPS

Standby current: 1 nA

10-lead MSOP (MSOP-8 size) and

3 mm × 3 mm, 10-lead LFCSP (SOT-23 size)

Pin-for-pin-compatible with 10-lead MSOP/PulSAR® ADCs

APPLICATIONS

Battery-powered equipment

Data acquisitions

Instrumentation

Medical instruments

Process controls

CODE

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–2.0

0

16384

32768

49152

65535

POSITIVE INL = +0.52LSB

NEGATIVE INL = –0.38LSB

Figure 1. Integral Nonlinearity vs. Code

1.

Protected by U.S. Patent 6,703,961.

FUNCTIONAL BLOCK DIAGRAM

AD7686

REF

GND

VDD

IN+

IN–

VIO

SDI

SCK

SDO

CNV

1.8V TO VDD

3- OR 4-WIRE INTERFACE

(SPI, DAISY CHAIN, CS)

0.5V TO 5V

5V

0 TO VREF

Figure 2.

Table 1. MSOP, LFCSP/SOT-23 14-/16-/18-Bit PulSAR ADC

Type

100

kSPS

250

kSPS

400 kSPS

to

500 kSPS

1000

kSPS

ADC

Driver

18-Bit True

AD7691

AD7690

AD7982

ADA4941

Differential

AD7982

ADA4941

16-Bit True

AD7684

AD7687

AD7688

ADA4941

Differential

AD7693

ADA4841

16-Bit Pseudo

AD7680

AD7685

AD7686

AD7980

ADA4941

Differential

AD7683

AD7694

14-Bit Pseudo

Differential

AD7940

AD7942

AD7946

ADA4941

GENERAL DESCRIPTION

The AD76861 is a 16-bit, charge redistribution, successive

approximation, analog-to-digital converter (ADC) that operates

from a single 5 V power supply, VDD. It contains a low power,

high speed, 16-bit sampling ADC with no missing codes, an

internal conversion clock, and a versatile serial interface port.

The part also contains a low noise, wide bandwidth, short

aperture delay track-and-hold circuit. On the CNV rising edge,

the AD7686 samples an analog input IN+ between 0 V to REF

with respect to a ground sense IN−. The reference voltage, REF,

is applied externally and can be set up to the supply voltage.

Power dissipation scales linearly with throughput.

The SPI-compatible serial interface also features the ability,

using the SDI input, to daisy-chain several ADCs on a single,

3-wire bus or provides an optional busy indicator. This device is

compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate

supply VIO.

The AD7686 is housed in a 10-lead MSOP or a 10-lead LFCSP

with operation specified from −40°C to +85°C.

Rev. C

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