OPA626 Datasheet, PDF (1/39 Pages) Texas Instruments – Analog-to-Digital Converter (ADC) Drivers

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OPA626, OPA2626
SBOS690 – JULY 2016
OPAx626 High-Speed, High-Precision, Low-Distortion 16-Bit and 18-Bit
Analog-to-Digital Converter (ADC) Drivers
1 Features
•1 Excellent Dynamic Performance:
– Low Distortion: –122 dBc for HD2 and
–140 dBc for HD3 at 100 kHz
– Gain Bandwidth (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
• Excellent DC Precision:
– Offset Voltage: ±100 µV (Maximum)
– Offset Voltage Drift: ±3 µV/ºC (Maximum)
– Low Quiescent Current: 2 mA (Typical)
• Input Common-Mode Range Includes Negative
Rail
• Rail-to-Rail Output
• Wide Temperature Range: Fully Specified from
–40°C to +125°C
2 Applications
• Precision SAR ADC Drivers
• Precision Voltage Reference Buffers
• Programmable Logic Controllers
• Test and Measurement Equipment
• Scientific Instrumentation
• High Throughput Data Acquisition Systems
• High Density, Multiplexed Data Acquisition
Systems
spacer
SAR ADC Driver
1k
1k
Input
Voltage
VREF / 4
5V
+ _OPA626
RFLT
4.7
RFLT
CFLT
10 nF
VREF 3.3 V
REF AVDD
ADS8860
GND
4.7
Copyright © 2016, Texas Instruments Incorporated
3 Description
The OPAx626 family of operational amplifiers are 16-
bit and 18-bit, high-precision, SAR ADC drivers with
low total harmonic distortion (THD) and noise. This
family of precision op amps 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 in applications such as the
ADS88xx family of SAR ADCs.
The OPAx626 family is available in 5-pin SOT and
8-pin VSSOP packages and is specified for operation
from –40°C to +125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA626
SOT (5)
2.90 mm × 1.60 mm
OPA2626
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
High Fidelity Topology
Improves Dynamic Performance
(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.