Datasheet

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ELECTRICAL CHARACTERISTICS
VCA8500
SBOS390A – JANUARY 2008 – REVISED MARCH 2008
All specifications at T
A
= +25 ° C, AVDD2 = 5.0V, AVDD1 = DVDD = 3.3V; single-ended, ac-coupled (1 µ F) input configuration to the preamp
(LNA), f
IN
= 5MHz, V
CNTL
= 1.0V, PG = 30dB, clamp disabled (CL = 1), LPF = 15MHz, and R
LOAD
= 1k Ω on each output to ground, unless
otherwise noted.
VCA8500
TEST
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LEVEL
(1)
PREAMPLIFIER (LNA)
LNA gain Single-ended input to differential output 20 dB C
Input voltage Linear operation (THD ≤ – 40dBc) 250 mV
PP
C
Input voltage noise At f = 2MHz 0.70 nV/ √ Hz B
Input current noise At f = 2MHz 3.0 pA/ √ Hz B
Input bias voltage (V
BL
) Internally generated +2.4 V B
Bandwidth Small-signal, – 3dB 55 MHz C
Input resistance
(2)
At f = 4MHz 8 k Ω C
Input capacitance
(2)
Including internal ESD and clamping diodes 30 pF C
TGC SIGNAL PATH (LNA, VCA, PGA)
PGA = 30dB, R
S
= 0 Ω , f = 2MHz 0.81 nV/ √ Hz B
Input voltage noise
PGA = 20dB, R
S
= 0 Ω , f = 2MHz 0.95 nV/ √ Hz B
Noise figure R
S
= 200 Ω , f = 1MHz to 10MHz 1.1 dB C
Group delay variation 1MHz to 10MHz ± 3 ns B
To within 1% of 2V
PP
output
Overload recovery time 80 ns B
(V
CNTL
= 0.54V), PGA = 20dB
Output voltage (V
OUT
) Differential, non-clipped 2 V
PP
B
Output common-mode voltage (V
CM
) +1.65 V B
DC to 10MHz, single-ended,
Output impedance 1 Ω C
either output
Output current R
L
= 5 Ω into V
CM
± 20 mA B
Second-harmonic distortion f
IN
= 5MHz, PGA = 20dB, V
OUT
= 1V
PP
– 50 – 60 dBc A
f
IN
= 5MHz, PGA = 30dB, V
OUT
= 2V
PP
– 42 – 55 dBc A
Third-harmonic distortion f
IN
= 5MHz, PGA = 20dB, V
OUT
= 1V
PP
– 48 – 68 dBc A
f
IN
= 5MHz, PGA = 30dB, V
OUT
= 2V
PP
– 40 – 50 dBc A
f
1
= 4.99MHz, f
2
= 5.01MHz,
Two-tone intermodulation – 52 dBc B
V
CNTL
= 1V; V
OUT
= 1V
PP
Worst case; PGA = 20dB, V
CNTRL
= 0.6V,
– 67 dBc B
V
OUT
= 1V
PP
Crosstalk, channel-to-channel
PGA = 30dB, V
OUT
= 1V
PP
– 66 dBc B
FILTER
Low-pass filter (second-order) – 3dB point 10, 15 MHz B
Tolerance ± 15 % B
High-pass filter (first-order, due to
– 3dB point, V
CNTL
= 1.2V 150 kHz C
internal ac coupling)
(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.
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