VCA2615 Datasheet, PDF (3/29 Pages) Texas Instruments – Dual, Low-Noise Variable-Gain Amplifier with Preamp

VCA2615
www.ti.com
SBOS316C − JULY 2005 − REVISED SEPTEMBER 2005
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;
fIN = 5MHz, LNP Gain (G1, G2) = 10, H/L = 0, V_CNTL = 2.5V; VCA output is 1VPP differential; CA, CB = 3.9µF, unless otherwise noted.
PARAMETER
PREAMPLIFIER (LNP and Buffer)
Input Resistance, RIN
Input Resistance
Input Capacitance
Maximum Input Voltage
Maximum Input Voltage
Input Voltage Noise
Input Current Noise
Bandwidth
2nd-Harmonic Distortion
3rd-Harmonic Distortion
LNP Gain Change Response Time
BUFFER (LNPOUT+A/B, LNPOUT−A/B)
Output Signal Range(2)
Output Common-Mode Voltage
Output Short-Circuit Current
Output Impedance
ACTIVE TERMINATION
Feedback Resistance(3), RF
VARIABLE-GAIN AMPLIFIER (VGA)
Peak Input Voltage
Upper −3dB Bandwidth
2nd-Harmonic Distortion
3rd-Harmonic Distortion
Slew-Rate
CONDITIONS
With Active Feedback Termination
Feedback Termination Open
LNP Gain (G1, G2) = 00 − Linear Operation(2)
LNP Gain (G1, G2) = 01 − Linear Operation(2)
LNP Gain (G1, G2) = 10 − Linear Operation(2)
LNP Gain (G1, G2) = 11 − Linear Operation(2)
Any LNP Gain − Overload (symmetrical clipping)
RS = 0Ω; Includes Buffer Noise, LNP Gain = 11
fIN = 5MHz
fIN = 5MHz
LNP Gain 00 to 11; to 90% Signal Level
RL > = 500Ω
FB (1-4) = 0111
FB (1-4) = 1011
FB (1-4) = 1101
FB (1-4) = 1110
FB (1-4) = 0000
Linear Operation(2), V_CNTL = 0.7V
V_CNTL = 2.5V, 1V_PP Differential Output
V_CNTL = 2.5V, 1V_PP Differential Output
VCA2615
MIN
TYP
MAX UNIT
See Note⁽¹⁾
100
45
2.3
0.78
0.39
0.23
5
0.8
1
50
−55
−55
0.1
kΩ
kΩ
pF
VPP
VPP
VPP
VPP
VPP
nV/√Hz
pA/√Hz
MHz
dBc
dBc
µs
3.3
VPP
1.85
V
60
mA
3
Ω
1500
Ω
1000
Ω
500
Ω
250
Ω
130
Ω
2
50
−60
−63
±100
V_PP
MHz
dBc
dBc
V/µs
PREAMPLIFIER AND VARIABLE-GAIN
AMPLIFIER (LNP AND VGA)
Input Voltage Noise
Clipping Voltage Range (VCLMP)
Clipping Voltage Variation
Output Impedance
Output Short-Circuit Current
Overload Distortion (2nd-Harmonic)
Crosstalk
Delay Matching
Overload Recovery Time
Maximum Output Load
Maximum Capacitive Output Loading
Maximum Output Signal(2)
Output Common-Mode Voltage
2nd-Harmonic Distortion
3rd-Harmonic Distortion
Upper −3dB Bandwidth
V_CLMP = 0.5V, VCA_OUT = 1.0V_PP
fIN = 5MHz, Single-Ended, Either Output
V_IN = 250mV_PP
fIN = 5MHz
50Ω in Series
Input Signal = 5MHz, V_CNTL = 1V
Input Signal = 5MHz, V_CNTL = 1V
V_CNTL = 2.5V
(1)
R_IN
+
(1
R_F
) ^AL2NP)
(2) _{2nd, 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.}
0.7
0.25 to 2.6
±50
3
60
−44
−70
±1
25
100
80
6
2.5
−45
−55
−45
−55
42
nV/√Hz
V
mV
Ω
mA
dBc
dBc
ns
ns
Ω
pF
V_PP
V
dB
dB
MHz
3