Datasheet

OPA691
7
SBOS226D
www.ti.com
TYPICAL CHARACTERISTICS: V
S
= ±5V (Cont.)
G = +2, R
F
= 402Ω, and R
L
= 100Ω, unless otherwise noted (see Figure 1).
100
10
1
INPUT VOLTAGE AND CURRENT NOISE DENSITY
Frequency (Hz)
100 1k 10k 100k 1M 10M
Current Noise (pA/√Hz)
Voltage Noise (nV/√Hz)
Noninverting Input Current Noise (12pA/√Hz)
Inverting Input Current Noise (15pA/√Hz)
Voltage Noise (1.7nV/√Hz)
–30
–40
–50
–60
–70
–80
–90
2-TONE, 3RD-ORDER
INTERMODULATION SPURIOUS
Single-Tone Load Power (dBm)
–8 –6 –4 –20246810
3rd-Order Spurious Level (dBc)
dBc = dB below carriers
50MHz
20MHz
10MHz
Load Power at Matched 50Ω Load
9
6
3
0
–3
–6
–9
Frequency (25MHz/div)
0 250MHz125MHz
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Normalized Gain to Capacitive Load (dB)
OPA691
R
S
V
IN
V
O
C
L
1kΩ
402Ω
402Ω
1kΩ is optional.
C
L
= 22pF
C
L
= 10pF
C
L
= 47pF
C
L
= 100pF
120
100
80
60
40
20
0
OPEN-LOOP TRANSIMPEDANCE GAIN/PHASE
Frequency (Hz)
10k 100k 1M 10M 100M 1G
Transimpedance Gain (20dBΩ/div)
0
–40
–80
–120
–160
–200
–240
Transimpedance Phase (40°/div)
|Z
OL
|
∠ Z
OL
65
60
55
50
45
40
35
30
25
20
CMRR AND PSRR vs FREQUENCY
Frequency (Hz)
1k 10k 100k 1M 10M 100M
Common-Mode Rejection Ratio (dB)
Power-Supply Rejection Ratio (dB)
+PSRR
CMRR
–PSRR
70
60
50
40
30
20
10
0
RECOMMENDED R
S
vs CAPACITIVE LOAD
Capacitive Load (pF)
1101001k
R
S
(Ω)