5 V

3.3 V

Input

Voltage

Mode

Control

REF

ADS8860

GND

AVDD

1 k

1 k

10 nF

4.7

+

±

OPA625

4.7

Frequency (kHz)

-175

-150

-125

-100

-75

-50

-25

0

0

50

100

150

200

250

300

350

400

450

500

-115.91 dBc (Third Harmonic)

THD = -110.8 dBc

SNR = 91.88 dB

SINAD = 91.86 dB

ENOB = 14.97

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OPA625, OPA2625

SBOS688 – APRIL 2015

OPAx625 High-Bandwidth, High-Precision, Low THD+N,

16-Bit and 18-Bit Analog-to-Digital Converter (ADC) Drivers

1 Features

3 Description

The OPAx625 family of operational amplifiers are

1

•

High-Drive Mode:

excellent 16-bit and 18-bit, SAR ADC drivers that are

–

GBW (G = 100): 120 MHz

high precision with low THD and noise allow for a

–

Slew Rate: 115 V/µs

unique power-scalable solution. This family of devices

is fully characterized and specified with a 16-bit

–

16-Bit Settling at 4-V Step: 280 ns

settling time of 280 ns that enables a true 16-bit

–

Low Voltage Noise: 2.5 nV/

√Hz at 10 kHz

effective number of bits (ENOB). Along with a high dc

–

Low Output Impedance: 1

Ω at 1 MHz

precision of only 100 µV offset voltage, a wide gain-

bandwidth product of 120 MHz, a low wideband noise

–

Offset Voltage: ±100 µV (max)

of 2.5 nV/

√Hz, this family is optimized for driving high-

–

Offset Voltage Drift: ±3 µV/ºC (max)

throughput, high-resolution SAR ADCs, such as the

–

Low Quiescent Current: 2 mA (typ)

ADS88xx family of SAR ADCs.

•

Low-Power Mode:

The OPAx625 features two operating modes: high-

–

GBW: 1 MHz

drive and low-power. In the innovative low-power

mode, the OPAx625 tracks the input signal allowing

–

Low Quiescent Current: 270 µA (typ)

the OPAx625 to transition from low-power mode to

•

Power-Scalable Features:

high-drive mode at 16-bit ENOB within 170 ns.

–

Ultrafast Transition from Low-Power to High-

The OPAx625 family is available in 6-pin SOT and

Drive Mode: 170 ns

10-pin

VSSOP

packages

and

is

specified

for

•

High AC and DC Precision:

operation from –40°C to +125°C.

–

Low Distortion: –122 dBc for HD2 and –140

dBc for HD3 at 100 kHz

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

Input Common-Mode Range Includes Negative

Rail

OPA625

SOT (6)

2.90 mm × 1.60 mm

OPA2625(2)

VSSOP (10)

3.00 mm × 3.00 mm

–

Rail-to-Rail Output

–

Wide Temperature Range: Fully Specified from

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

–40°C to +125°C

(2) OPA2625 is product preview.

2 Applications

•

Precision SAR ADC Drivers

•

Precision Voltage Reference Buffers

•

Programmable Logic Controllers

•

Test and Measurement Equipment

•

Power-Sensitive Data Acquisition Systems

SAR ADC Driver

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.