VCA8500 Datasheet, PDF (3/15 Pages) Texas Instruments – 8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp

VCA8500
www.ti.com
SBOS390 – JANUARY 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, VCA output is 2V_PP differential, R_LOAD = 1kΩ on each output to ground, unless otherwise noted.
PARAMETER
PREAMPLIFIER (LNA)
LNA gain
Accuracy
Z_IN
Input resistance
C_IN
Input capacitance
V_IN
Input voltage
Maximum input voltage⁽²⁾
e_N, RTI
I_N, RTI
V_CMI
BW
Input voltage noise
Input current noise
Common-mode voltage, inputs
Bandwidth
SR
Slew rate
TGC SIGNAL PATH (LNA, VCA, PGA)
e_N, RTI
Input voltage noise
Z_OUT
I_OUT-SC
Output impedance
Output short-circuit current
Overload distortion
(second-harmonic)
Crosstalk, channel-to-channel
NF
C_L
V_OUT
V_CMO
HD2
Noise figure
Group delay variation
Delay matching
Overload recovery time
Maximum capacitive output loading
Output voltage range⁽²⁾
Output common-mode voltage
Second-harmonic distortion
HD3
Third-harmonic distortion
IMD3
Two-tone intermodulation
TEST CONDITIONS
Single-ended input to differential output
At f = 4MHz
Including internal ESD and clamping
diodes
Linear operation (THD ≤ –40dBc)
Internal diode limited
At f = 2MHz (calculated)
At f = 2MHz
Internally generated
Small-signal, –3dB
PGA = 30dB, R_S = 0Ω, f = 2MHz
PGA = 20dB
dc to 10MHz, Single-Ended,
Either Output
V_IN = 250mV_PP
Worst case; Gain = TBDdB
Gain = max (50dB)
R_S = R_IN = 50Ω (TBDdB max gain)
1MHz to TBDMHz, full gain range
Between channels
To within 1% of 2V_PP output at 40dB gain
(V_CNTL = TBDV + 30dB PGA)
50Ω series R in each output
Differential, non-clipped
f_IN = 5MHz, V_CNTL = TBDV;
Gain = TBD, V_OUT = 1V_PP
f_IN = 5MHz, V_CNTL = TBDV;
Max gain, V_OUT = 2V_PP
f_IN = 5MHz, V_CNTL = TBDV;
Gain = TBD, V_OUT = 1V_PP
f_IN = 5MHz, V_CNTL = TBDV;
Max gain, V_OUT = 2V_PP
f₁ = TBDMHz, f₂ = TBDMHz,
V_CNTL = TBDV; V_OUT = 1V_PP
MIN
–40
TBD
–50
–42
–48
–40
VCA8500
TYP
20
±0.5
8
30
250
600
0.75
3.0
2.4
70
TBD
0.8
0.9
<1
TBD
< –35
–55
–50
TBD
±2
TBD
1
TBD
2
1.65
TBD
–50
TBD
–48
–40
MAX
35
±3
UNIT
TEST
LEVEL ⁽¹⁾
dB
dB
kΩ
pF
mV_PP
mV_PP
nV/√Hz
pA/√Hz
V
MHz
V/µs
nV/√Hz
nV/√Hz
Ω
mA
dBc
dBc
dBc
dB
ns
ns
µs
pF
V_PP
V_DC
dBc
dBc
dBc
dBc
dBc
(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) Second, third-harmonic distortion less than or equal to −TBDdB.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): VCA8500
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