OPA625 Datasheet, PDF (1/46 Pages) Texas Instruments – OPAx625 High-Bandwidth, High-Precision, Low THD+N,16-Bit and 18-Bit Analog-to-Digital Converter (ADC) Drivers

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OPA625, OPA2625
SBOS688A – APRIL 2015 – REVISED OCTOBER 2015
OPAx625 High-Bandwidth, High-Precision, Low THD+N,
16-Bit and 18-Bit Analog-to-Digital Converter (ADC) Drivers
1 Features
•1 High-Drive Mode:
– GBW (G = 100): 120 MHz
– Slew Rate: 115 V/µs
– 16-Bit Settling at 4-V Step: 280 ns
– Low Voltage Noise: 2.5 nV/√Hz at 10 kHz
– Low Output Impedance: 1 Ω at 1 MHz
– Offset Voltage: ±100 µV (max)
– Offset Voltage Drift: ±3 µV/ºC (max)
– Low Quiescent Current: 2 mA (typ)
• Low-Power Mode:
– GBW: 1 MHz
– Low Quiescent Current: 270 µA (typ)
• Power-Scalable Features:
– Ultrafast Transition from Low-Power to High-
Drive Mode: 170 ns
• High AC and DC Precision:
– Low Distortion: –122 dBc for HD2 and –140
dBc for HD3 at 100 kHz
– Input Common-Mode Range Includes Negative
Rail
– Rail-to-Rail Output
– Wide Temperature Range: Fully Specified from
–40°C to +125°C
3 Description
The OPAx625 family of operational amplifiers are
excellent 16-bit and 18-bit, high-precision, SAR ADC
drivers with low THD and noise that allow for a
unique power-scalable solution. This family of devices
is fully characterized and specified with a 16-bit
settling time of 280 ns that enables a true 16-bit
effective number of bits (ENOB). With a high dc
precision of only 100 µV offset voltage, a wide gain-
bandwidth product of 120 MHz, and a low wideband
noise of 2.5 nV/√Hz, this family is optimized for
driving high-throughput, high-resolution SAR ADCs,
such as the ADS88xx family of SAR ADCs.
The OPAx625 features two operating modes: high-
drive and low-power. In the innovative low-power
mode, the OPAx625 tracks the input signal allowing
the device to transition from low-power mode to high-
drive mode at 16-bit ENOB within 170 ns.
The OPAx625 family is available in 6-pin SOT and
10-pin VSSOP packages and is specified for
operation from –40°C to +125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA625
SOT (6)
2.90 mm × 1.60 mm
OPA2625
VSSOP (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
2 Applications
• Precision SAR ADC Drivers
• Precision Voltage Reference Buffers
• Programmable Logic Controllers
• Test and Measurement Equipment
• Power-Sensitive Data Acquisition Systems
Input
Voltage
SAR ADC Driver
1 k
1 k
VREF / 4
Mode
Control
5V
±
OPA625
+
4.7
4.7
10 nF
VREF 3.3 V
REF AVDD
ADS8860
GND
16-Bit SAR ADC, f_IN = 10-kHz, 1-MSPS FFT
0
-25
-50
-75
-100
THD = -110.8 dBc
SNR = 91.88 dB
SINAD = 91.86 dB
ENOB = 14.97
-115.91 dBc (Third Harmonic)
-125
-150
-175
0
50 100 150 200 250 300 350 400 450 500
Frequency (kHz)
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. PRODUCTION DATA.