VCA8500_0803 Datasheet, PDF (4/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
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ELECTRICAL CHARACTERISTICS (continued)
All specifications at T_A = +25°C, AVDD2 = 5.0V, AVDD1 = DVDD = 3.3V; single-ended, ac-coupled (1µF) input configuration to the preamp
(LNA), f_IN = 5MHz, V_CNTL = 1.0V, PG = 30dB, clamp disabled (CL = 1), LPF = 15MHz, and R_LOAD = 1kΩ on each output to ground, unless
otherwise noted.
PARAMETER
ACCURACY
Gain (PGA)
Total gain, maximum
Gain range
Gain range
Gain slope
Gain error, absolute
Gain matching
Output offset voltage
Clamp level (V_OUT)
GAIN CONTROL INTERFACE
Input voltage range (V_CNTL)
Input resistance
Response time
Gain control bandwidth
CW SIGNAL PATH
Output transconductance (V/I)
Dynamic CW output current, max
Static CW output current (sink)
Output common-mode voltage (V_CM0)
Output compliance range
Output capacitance
Output impedance
Input voltage noise, CW mode
Signal-dependent noise (RTO)
Output noise correlation factor
TEST CONDITIONS
Selectable through SPI™
LNA + PGA gain, V_CNTL = 1.2V
V_CNTL = 0V to 1.2V
V_CNTL = 0.1V to 1.0V
V_CNTL = 0.1V to 1.0V
0V < V_CNTL < 0.1V
0.1V < V_CNTL < 1.0V
1.0V < V_CNTL < 1.2V
Channel-to-channel
Differential
Single-ended ⁽³⁾
CL = 0
CL = 1 (clamp disabled)
Gain range = 46dB
V_CNTL= 0V to 1.2V step;
to 90% signal level, V_OUT = 1V_PP
At V_IN = 100mV_PP
At V_IN = 200mV_PP
Supplied externally
Symmetric around V_CMO
At f = 2MHz
At 2kHz offset from 2MHz CW carrier
At 2kHz offset from 5MHz CW carrier
Summing of eight channels (all modes)
[compared to ideal 0dB]
VCA8500
MIN
TYP
MAX
20, 25,
27, 30
48
49.5
51
46
40
44.4
±0.5
–1.5
±0.5
+1.5
±0.5
±0.25
±0.5
–25
±1
+25
–50
±25
+50
1.7
2.8
0 to 1.2
25
0.5
1.5
14
16.4
18
14.5
2.9
0.9
+2.5
±0.5
10
50
1.15
+2
+2
0.6
UNIT
TEST
LEVEL ⁽¹⁾
dB
A
dB
A
dB
A
dB
A
dB/V
A
dB
A
dB
A
dB
A
dB
A
mV
A
mV
A
V_PP
A
V_PP
B
V
A
kΩ
C
µs
B
MHz
C
mA/V
A
mA/V
B
mA_PP
B
mA
B
V
B
V
B
pF
C
kΩ
C
nV/√Hz
B
dB
B
dB
B
dB
B
(3) Deviation from ideal common-mode voltage (V_CM = 1.65V).
4
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