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OPA862 データシート(PDF) 23 Page - Texas Instruments

部品番号 OPA862
部品情報  OPA862 High Input Impedance, Single-Ended to Differential ADC Driver
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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OPA862 データシート(HTML) 23 Page - Texas Instruments

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8.2.1.3 Application Curves
Input voltage, VIN (V)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-6
-4.5
-3
-1.5
0
1.5
3
4.5
6
D100
VOUT
VOUT+
VOD
Figure 8-3. DC Transfer Characteristics
Time, 250 ns per division
-5.5
-4.5
-3.5
-2.5
-1.5
-0.5
0.5
1.5
2.5
3.5
4.5
5.5
D100
VOUT
VOUT+
VOD
VIN
Figure 8-4. Transient Output Response
8.2.2 Transimpedance Amplifier Configuration
With recent advancements in light-sensing technology, transimpedance (TIA) applications are becoming popular,
ranging in signal bandwidth needs from tens of kHz to hundreds of MHz. Because the current output of the
photodiode in these TIA applications is unipolar, a key challenge in interfacing with the fully differential input
analog-to-digital converters (ADCs) is maximizing the differential signal to the ADC in order to maximize the
signal-to-noise ratio (SNR).
As illustrated in the output waveform of Figure 8-6, only half the differential output signal swing of the FDA is
available. On the contrary, by using the OPA862 as the TIA stage, a single-device interface to the ADC can be
designed that also allows the full differential swing to the ADC and set the desired output common-mode as
shown in Figure 8-5. VREF is used to set the output common-mode voltage and VDC is used to DC shift the
outputs such that for a zero photodiode current, VOD (equal to VOUT+ – VOUT–) is at one of the peaks of the
desired differential peak-to-peak swing. Whether the VOD peak at the zero photodiode current is at a high or low
peak is determined by the direction of current through RF in the presence of the photodiode signal current.
R
F
C
F
V
BIAS
A1
+
±
A2
+
±
700
700
OPA862
R
INT
R
INT
V
OUT+
V
OUT±
V
REF
V
DC
V
REF
V
OUT±
V
OUT+
Figure 8-5. Improved TIA Signal Chain With the OPA862
www.ti.com
OPA862
SBOS919C – AUGUST 2019 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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