Datasheet

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SBOS316D − JULY 2005 − REVISED OCTOBER 2008
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3
ELECTRICAL CHARACTERISTICS
All specifications at T
A
= +25°C, V
DD
= 5V, load resistance = 500Ω on each output to ground; the input to the preamp (LNP) is single-ended;
f
IN
= 5MHz, LNP Gain (G1, G2) = 10, H
/L = 0, V
CNTL
= 2.5V; VCA output is 1V
PP
differential; CA, CB = 3.9µF, unless otherwise noted.
VCA2615
PARAMETER
CONDITIONS
MIN TYP MAX
UNIT
PREAMPLIFIER (LNP and Buffer)
Input Resistance, R
IN
With Active Feedback Termination See Note
(1)
kΩ
Input Resistance Feedback Termination Open 100 kΩ
Input Capacitance 45 pF
Maximum Input Voltage LNP Gain (G1, G2) = 00 − Linear Operation
(2)
2.3 V
PP
LNP Gain (G1, G2) = 01 − Linear Operation
(2)
0.78 V
PP
LNP Gain (G1, G2) = 10 − Linear Operation
(2)
0.39 V
PP
LNP Gain (G1, G2) = 11 − Linear Operation
(2)
0.23 V
PP
Maximum Input Voltage Any LNP Gain − Overload (symmetrical clipping) 5 V
PP
Input Voltage Noise R
S
= 0Ω; Includes Buffer Noise, LNP Gain = 11 0.8 nV/√Hz
Input Current Noise 1 pA/√Hz
Bandwidth 50 MHz
2nd-Harmonic Distortion f
IN
= 5MHz −55 dBc
3rd-Harmonic Distortion f
IN
= 5MHz −55 dBc
LNP Gain Change Response Time LNP Gain 00 to 11; to 90% Signal Level 0.1 µs
BUFFER (LNP
OUT+
A/B, LNP
OUT−
A/B)
Output Signal Range
(2)
R
L
> = 500Ω 3.3 V
PP
Output Common-Mode Voltage 1.85 V
Output Short-Circuit Current 60 mA
Output Impedance 3 Ω
ACTIVE TERMINATION
Feedback Resistance
(3)
, R
F
FB (1-4) = 0111 1500 Ω
FB (1-4) = 1011 1000 Ω
FB (1-4) = 1101 500 Ω
FB (1-4) = 1110 250 Ω
FB (1-4) = 0000 130 Ω
VARIABLE-GAIN AMPLIFIER (VGA)
Peak Input Voltage Linear Operation
(2)
, V
CNTL
= 0.7V 2 V
PP
Upper −3dB Bandwidth 50 MHz
2nd-Harmonic Distortion V
CNTL
= 2.5V, 1V
PP
Differential Output −60 dBc
3rd-Harmonic Distortion V
CNTL
= 2.5V, 1V
PP
Differential Output −63 dBc
Slew-Rate ±100 V/µs
PREAMPLIFIER AND VARIABLE-GAIN
AMPLIFIER (LNP AND VGA)
Input Voltage Noise 0.7 nV/√Hz
Clipping Voltage Range (V
CLMP
) 0.25 to 2.6 V
Clipping Voltage Variation V
CLMP
= 0.5V, VCA
OUT
= 1.0V
PP
±50 mV
Output Impedance f
IN
= 5MHz, Single-Ended, Either Output 3 Ω
Output Short-Circuit Current 60 mA
Overload Distortion (2nd-Harmonic) V
IN
= 250mV
PP
−44 dBc
Crosstalk f
IN
= 5MHz −70 dBc
Delay Matching ±1 ns
Overload Recovery Time 25 ns
Maximum Output Load 100 Ω
Maximum Capacitive Output Loading 50Ω in Series 80 pF
Maximum Output Signal
(2)
6 V
PP
Output Common-Mode Voltage 2.5 V
2nd-Harmonic Distortion Input Signal = 5MHz, V
CNTL
= 1V −45 −55 dB
3rd-Harmonic Distortion Input Signal = 5MHz, V
CNTL
= 1V −45 −55 dB
Upper −3dB Bandwidth V
CNTL
= 2.5V 42 MHz
(1)
R
IN
+
R
F
(1 )
A
LNP
2
)
(2)
2nd−harmonic, 3rd-harmonic distortion less than or equal to −30dBc.
(3)
See Table 5.
(4)
Referred to best-fit dB linear curve.
(5)
Parameters ensured by design; not production tested.
(6)
Do not leave inputs floating; no internal pull-up/pull-down resistors.