VCA8500_0803 Datasheet, PDF (3/40 Pages) Texas Instruments – 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
www.ti.com
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
ELECTRICAL CHARACTERISTICS
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
TEST CONDITIONS
MIN
PREAMPLIFIER (LNA)
LNA gain
Single-ended input to differential output
Input voltage
Linear operation (THD ≤ –40dBc)
Input voltage noise
At f = 2MHz
Input current noise
At f = 2MHz
Input bias voltage (V_BL)
Bandwidth
Internally generated
Small-signal, –3dB
Input resistance⁽²⁾
At f = 4MHz
Input capacitance⁽²⁾
Including internal ESD and clamping diodes
TGC SIGNAL PATH (LNA, VCA, PGA)
Input voltage noise
Noise figure
Group delay variation
PGA = 30dB, R_S = 0Ω, f = 2MHz
PGA = 20dB, R_S = 0Ω, f = 2MHz
R_S = 200Ω, f = 1MHz to 10MHz
1MHz to 10MHz
Overload recovery time
Output voltage (V_OUT)
Output common-mode voltage (V_CM)
Output impedance
To within 1% of 2V_PP output
(V_CNTL = 0.54V), PGA = 20dB
Differential, non-clipped
DC to 10MHz, single-ended,
either output
Output current
Second-harmonic distortion
Third-harmonic distortion
Two-tone intermodulation
Crosstalk, channel-to-channel
FILTER
R_L = 5Ω into V_CM
f_IN = 5MHz, PGA = 20dB, V_OUT = 1V_PP
–50
f_IN = 5MHz, PGA = 30dB, V_OUT = 2V_PP
–42
f_IN = 5MHz, PGA = 20dB, V_OUT = 1V_PP
–48
f_IN = 5MHz, PGA = 30dB, V_OUT = 2V_PP
–40
f₁ = 4.99MHz, f₂ = 5.01MHz,
V_CNTL = 1V; V_OUT = 1V_PP
Worst case; PGA = 20dB, V_CNTRL = 0.6V,
V_OUT = 1V_PP
PGA = 30dB, V_OUT = 1V_PP
Low-pass filter (second-order)
–3dB point
Tolerance
High-pass filter (first-order, due to
internal ac coupling)
–3dB point, V_CNTL = 1.2V
VCA8500
TYP
20
250
0.70
3.0
+2.4
55
8
30
0.81
0.95
1.1
±3
80
2
+1.65
1
±20
–60
–55
–68
–50
–52
–67
–66
10, 15
±15
150
MAX
UNIT
TEST
LEVEL ⁽¹⁾
dB
C
mV_PP
C
nV/√Hz
B
pA/√Hz
B
V
B
MHz
C
kΩ
C
pF
C
nV/√Hz
B
nV/√Hz
B
dB
C
ns
B
ns
B
V_PP
B
V
B
Ω
C
mA
B
dBc
A
dBc
A
dBc
A
dBc
A
dBc
B
dBc
B
dBc
B
MHz
B
%
B
kHz
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, not production tested. (C) Typical value only for information.
(2) See Figure 29 of the Typical Characteristics.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): VCA8500
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