DGN−8
D−8
DDA−8
THS4631
www.ti.com
SLOS451A–DECEMBER 2004–REVISED MARCH 2005
HIGH-VOLTAGE, HIGH SLEW RATE, WIDEBAND
FET-INPUT OPERATIONAL AMPLIFIER
FEATURES
DESCRIPTION
•
High Bandwidth:
The THS4631 is a high-speed, FET-input operational
amplifier designed for applications requiring wideband
operation, high-input impedance, and high-power
– 325 MHz in Unity Gain
– 210 MHz Gain Bandwidth Product
High Slew Rate:
supply voltages. By providing
a 210-MHz gain
•
bandwidth product, ±15-V supply operation, and
100-pA input bias current, the THS4631 is capable of
simultaneous wideband transimpedance gain and
large output signal swing. The fast 1000 V/µs slew
rate allows for fast settling times and good harmonic
distortion at high frequencies. Low current and volt-
age noise allow amplification of extremely low-level
input signals while still maintaining a large sig-
nal-to-noise ratio.
– 900 V/µs (G = 2)
– 1000 V/µs (G = 5)
•
•
•
•
•
•
•
•
Low Distortion of –76 dB, SFDR at 5 MHz
Maximum Input Bias Current: 100 pA
Input Voltage Noise: 7 nV/√Hz
Maximum Input Offset Voltage: 500 µV at 25°C
Low Offset Drift: 2.5 µV/°C
Input Impedance: 109 || 3.9 pF
Wide Supply Range: ± 5 V to ± 15 V
High Output Current: 95 mA
The characteristics of the THS4631 make it ideally
suited for use as a wideband photodiode amplifier.
Photodiode output current is a prime candidate for
transimpedance amplification as shown below. Other
potential applications include test and measurement
systems requiring high-input impedance, ADC and
DAC buffering, high-speed integration, and active
filtering.
APPLICATIONS
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•
•
•
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Wideband Photodiode Amplifier
High-Speed Transimpedance Gain Stage
Test and Measurement Systems
Current-DAC Output Buffer
Active Filtering
The THS4631 is offered in an 8-pin SOIC (D), and
the 8-pin SOIC (DDA) and MSOP (DGN) with
PowerPAD™ package.
Related FET Input Amplifier Products
High-Speed Signal Integrator
High-Impedance Buffer
SLEW
RATE
(V/µS)
VOLTAGE
NOISE
(nV/√Hz)
VS
(V)
GBWP
(MHz)
MINIMUM
GAIN
DEVICE
OPA656
OPA657
OPA627
THS4601
±5
±5
230
1600
16
290
700
55
7
1
7
1
1
Photodiode Circuit
4.8
4.5
5.4
C
R
F
±15
±15
180
100
F
_
+
λ
R
L
−V
(Bias)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPad is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated