Datasheet

ELECTRICAL CHARACTERISTICS: V
S
= ± 5V
VCA821
www.ti.com ....................................................................................................................................... SBOS407B – DECEMBER 2007 – REVISED DECEMBER 2008
At A
VMAX
= 20dB, R
F
= 402 Ω , R
G
= 80 Ω , R
L
= 100 Ω , unless otherwise noted.
VCA821
MIN/MAX OVER
TYP TEMPERATURE
0 ° C to – 40 ° C to MIN/ TEST
PARAMETER CONDITIONS +25 ° C +25 ° C
(2)
70 ° C
(3)
+85 ° C
(3)
UNITS MAX LEVEL
(1)
AC PERFORMANCE
Small-Signal Bandwidth G = 6dB, V
O
= 500mV
PP
710 MHz typ C
G = 20dB, V
O
= 500mV
PP
420 MHz typ C
G = 40dB, V
O
= 500mV
PP
170 MHz typ C
Large-Signal Bandwidth G = 20dB, V
O
= 4V
PP
320 MHz typ C
Gain Control Bandwidth V
O
= 200mV
PP
330 240 235 235 MHz min B
Bandwidth for 0.1dB Flatness G = 20dB, V
O
= 200mV
PP
135 MHz typ C
Slew Rate G = 20dB, V
O
= 5V Step 2500 1800 1700 1700 V/ µ s min B
Rise-and-Fall Time G = 20dB, V
O
= 5V Step 1.5 1.8 1.9 1.9 ns max B
Settling Time to 0.01% G = 20dB, V
O
= 5V Step 11 ns typ C
Harmonic Distortion
2nd Harmonic V
O
= 2V
PP
, f = 20MHz – 66 – 64 – 64 – 64 dBc min B
3rd Harmonic V
O
= 2V
PP
, f = 20MHz – 63 – 61 – 61 – 61 dBc min B
Input Voltage Noise f > 100kHz 6.0 nV/ √ Hz typ C
Input Current Noise f > 100kHz 2.6 pA/ √ Hz typ C
GAIN CONTROL
Absolute Gain Error G
MAX
= 20dB, V
G
= 2V ± 0.1 ± 0.4 ± 0.5 ± 0.6 dB max A
V
ctrl0
0.85 V typ C
V
Slope
0.09 V typ C
Absolute Gain Error G
MAX
= 20dB, V
G
= 1V, (G = 18.06 ± 0.3 ± 0.4 ± 0.5 ± 0.6 dB max A
dB)
Gain at V
G
= 0.2V relative to max gain – 26 – 24 – 24 – 23 dB max A
Gain Control Bias Current 10 16 16.6 16.7 µ A max A
Average Gain Control Bias Current Drift ± 12 ± 12 nA/ ° C max B
Gain Control Input Impedance 1.5 || 0.6 M Ω || pF typ C
DC PERFORMANCE
Input Offset Voltage G = 20dB, V
CM
= 0V, V
G
= 1V ± 4 ± 17 ± 17.8 ± 19 mV max A
Average Input Offset Voltage Drift G = 20dB, V
CM
= 0V, V
G
= 1V 30 30 µ V/ ° C max B
Input Bias Current G = 20dB, V
CM
= 0V, V
G
= 1V 19 25 29 31 µ A max A
Average Input Bias Current Drift G = 20dB, V
CM
= 0V, V
G
= 1V 90 90 nA/ ° C max B
Input Offset Current G = 20dB, V
CM
= 0V, V
G
= 1V ± 0.5 ± 2.5 ± 3.2 ± 3.5 µ A max A
Average Input Offset Current Drift G = 20dB, V
CM
= 0V, V
G
= 1V ± 16 ± 16 nA/ ° C max B
Max Current Through Gain Resistance ± 2.6 ± 2.55 ± 2.55 ± 2.5 mA max B
INPUT
Most Positive Common Mode Input Voltage R
L
= 100 Ω +1.6 +1.6 +1.6 +1.6 V min A
Most Negative Common Mode Input Voltage R
L
= 100 Ω – 2.1 -2.1 – 2.1 – 2.1 V max A
Common-Mode Rejection Ratio V
CM
= ± 0.5V 80 65 60 60 dB min A
Input Impedance
Differential 0.9 || 0.6 M Ω || pF typ C
Common-Mode 1 || 2 M Ω || pF typ C
(1) Test levels: (A) 100% tested at +25 ° C. Over temperature limits set by characterization and simulation. (B) Limits set by characterization
and simulation. (C) Typical value only for information.
(2) Junction temperature = ambient for +25 ° C tested specifications.
(3) Junction temperature = ambient at low temperature limit; junction temperature = ambient +23 ° C at high temperature limit for over
temperature specifications.
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