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ADA4960-1ACPZ-R2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
Data Sheet ADA4960-1
Rev. A | Page 15 of 19
GAIN ADJUST
The gain of the ADA4960-1 is set with a single resistor, R
G
,
connected across the IIP and IIN pins. Because the output
impedance is 150 Ω, the load affects the gain. The voltage
gain can be calculated for both differential and single-ended
inputs as follows:
( )
G
L
L
V
R
R
R
A
+
+
=
35.5
150
150
4.7
where R
L
and R
G
are the load and gain-setting resistors.
18
16
14
12
10
8
6
4
2
0
0 50 100 150 200 250
R
G
(Ω)
R
L
= 1kΩ
R
L
= 100Ω
A
V
(V/V)
08458-029
R
L
= 500Ω
R
L
= 200Ω
Figure 34. A
V
vs. R
G
for R
L
= 100 Ω, R
L
= 200 Ω, R
L
= 500 Ω, and R
L
= 1 kΩ
Table 5. A
V
vs. R
G
for R
L
= 100 Ω, R
L
= 200 Ω, R
L
= 500 Ω, and
R
L
= 1 kΩ
A
V
(dB)
R
G
R
L
= 100 Ω R
L
= 200 Ω R
L
= 500 Ω R
L
= 1 kΩ
0 246 370 505 576
6 106 167 237 271
12 35.2 65.7 101 118
18 0 15.2 32.8 41.7
BANDWIDTH EXTENSION
The bandwidth of the ADA4960-1 can be extended for both
differential and single-ended input configurations by connecting
a capacitor, C
S
, in parallel with the gain-setting resistor, R
G
, as
shown in Figure 35.
08458-027
IIP
VIP
R1
25Ω
50Ω
R2
25Ω
0.1µF
5V
ETC1-1-13
ADA4960-1
0.1µF
0.1µF
0.1µF
AC
VOP
VON
IIN
VIN
R
G
C
S
R
L
2
R
L
2
Figure 35. ADA4960-1 with Bandwidth Extension
Figure 36 shows the bandwidth extension for 6 dB and 12 dB gains.
Figure 37 shows the recommended C
S
values for most gains (dB).
14
12
10
8
6
4
2
0
10 100 1k 10k
FREQUENCY (MHz)
A
V
(dB)
08458-031
C
S
= 2.2pF
C
S
= 0.1pF
Figure 36. Bandwidth Extension for 6 dB and 12 dB Gains
14
12
10
8
6
4
2
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
C
S
(pF)
A
V
(dB)
08458-032
Figure 37. Recommended C
S
Values for Most Gains
ADA4960-1 Data Sheet
Rev. A | Page 16 of 19
ADC INTERFACING
The ADA4960-1 is a high speed amplifier with linearity
performance to drive high speed ADCs up to 1 GHz. Several
options are available to the designer to interface with an ADC.
The ADA4960-1 in Figure 38 is a differential input configuration,
using an input balun to provide the differential input signal. The
25 Ω resistors provide the input source match. The ADA4960-1
outputs can be directly connected to the ADC inputs as long as
the ADC input common mode is within the output common-
mode range of the ADA4960-1. The ADC V
CM
output pin is
connected to the ADA4960-1 VOCM input pin to align the
ADA4960-1 output voltages with the ADC inputs.
A 100 Ω resistor across the outputs of the ADA4960-1 enhances
system bandwidth and distortion performance when the ADA4960-1
is driving an ADC with high input impedance. Lighter load
resistance improves distortion performance and lowers the
overall bandwidth.
IIP
VIP
25Ω
25Ω
50Ω
100Ω
0.1µF
5V
ETC1-1-13
ADA4960-1
0.1µF
AC
IIN
VIN
R
G
08458-033
VOP
V
IN+
V
IN–
ADC
VON
VOCM
V
CM
Figure 38. Differential Input Configuration Directly Driving the ADC
The ADA4960-1 in Figure 39 is a single-ended input configura-
tion. The input is matched to the source with 50 Ω resistors. The
ADA4960-1 outputs can be directly connected to the ADC inputs
as long as the ADC input common mode is within the output
common-mode range of the ADA4960-1.
08458-034
ADA4960-1
VOP
V
IN+
V
IN–
ADC
5V
VON
VOCM
V
CM
IIP
VIP
50Ω
25Ω
50Ω
0.1µF
0.1µF
AC
IIN
VIN
R
G
100Ω
Figure 39. Single-Ended Input Configuration Directly Driving the ADC
The signal source can be directly connected to the ADA4960-1
inputs as long as the source dc level is within the common-mode
input range of the ADA4960-1, as shown in Figure 40.
08458-050
ADA4960-1
VOP
V
IN+
V
IN–
ADC
5V
VON
VOCM
V
CM
IIP
VIP
50Ω
25Ω
50Ω
AC
IIN
VIN
R
G
V
REF
V
REF
V
REF
100Ω
Figure 40. Single-Ended Input Configuration, DC-Coupled Inputs and
Outputs
When the ADC input common mode is outside the output
common-mode range of the ADA4960-1, the outputs can be
ac-coupled to provide coupling, as shown in Figure 41.
08458-035
ADA4960-1
VOP
V
IN+
V
IN–
ADC
5V
VON
IIP
VIP
50Ω
25Ω
50Ω
0.1µF
0.1µF
0.1µF
AC
IIN
VIN
R
G
0.1µF
100Ω
Figure 41. Single-Ended Input Configuration, AC-Coupled to the ADC
LINE DRIVER APPLICATIONS
The user accessible gain adjust and bandwidth extension
features allow configuration of the ADA4960-1 for line driver
and channel equalization applications from dc to 6.5 Gbps.
Because of its extremely low distortion performance and high
linearity, the ADA4960-1 can be deployed in cable and backplane
channels to extend channel length and improve signaling
margin for serial links using receive equalization and transmit
pre-emphasis. The ADA4960-1 unidirectional signal path is
protocol and encoding agnostic, supporting myriad signaling
types such as NRZ and PAM2/4/8/N, coded (8b/10b), uncoded,
and out-of-band (SATA-OOB) data.
Data Sheet ADA4960-1
Rev. A | Page 17 of 19
OVERDRIVE AND RECOVERY
When overdriven, the ADA4960-1 limits its outputs to 3.4 V
typical with no overshoot, as shown in Figure 42. This feature
protects the ADC from transients, eliminating the need for
additional external clamping at the inputs of the ADC.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
–8 –6 –4 –2 0 2 4 6 8 10 12 14
TIME
(ns)
V
OUT
(V)
08458-051
V
OUTP
V
OUTN
Figure 42. Output Overdrive, V
IN
= 1 V p-p, A
V
=12 dB
Recovery from overdrive is 6.7 ns to 1%, 9.3 ns to 0.5%, and
12.6 ns to 0.25% of the final output voltage, see Figure 43.
0.096
0.072
0.048
0.024
0
–0.024
0 2 4 6 8 10 12 14
TIME (ns)
V
OUT
(V)
08458-052
V
OUTP
– V
OUTN
VOCM
0.5%
0.5%
0.25%
0.25%
1%
Figure 43. Output Overdrive Recovery
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

ADA4960-1ACPZ-R2

Mfr. #:
Buy ADA4960-1ACPZ-R2
Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers 5GHz Low Distortion ADC Drver/Line Drver
Lifecycle:
New from this manufacturer.
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