AD8376ACPZ-R7 Analog Devices Inc, AD8376ACPZ-R7 Datasheet - Page 17

• Manufacturer Part Number: AD8376ACPZ-R7
• Description: If Cellular Dual DGA
• Manufacturer: Analog Devices Inc

Specifications of AD8376ACPZ-R7

• Design Resources: Using AD8376 to Drive Wide Bandwidth ADCs for High IF AC-Coupled Appls (CN0002) High Performance, Dual Channel IF Sampling Receiver (CN0140)
• Amplifier Type: Variable Gain
• Number Of Circuits: 2
• Output Type: Differential
• Slew Rate: 5000 V/µs
• -3db Bandwidth: 700MHz
• Current - Input Bias: 900nA
• Current - Supply: 250mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AD8376ACPZ-R7TR

Figure 42 is optimized for driving some of Analog Devices
popular unbuffered ADCs, such as the AD9246, AD9640,
and AD6655. Table 5 includes antialiasing filter component
recommendations for popular IF sampling center frequencies.
Inductor L5 works in parallel with the on-chip ADC input
capacitance and a portion of the capacitance presented by C4 to
form a resonant tank circuit. The resonant tank helps to ensure
the ADC input looks like a real resistance at the target center
frequency. Additionally, the L5 inductor shorts the ADC inputs
Table 5. Interface Filter Recommendations for Various IF Sampling Frequencies
Center Frequency
96 MHz
140 MHz
170 MHz
211 MHz
50Ω
1 dB Bandwidth
27 MHz
30 MHz
32 MHz
32 MHz
1:3
Figure 42. Narrow-Band IF Sampling Solution for Unbuffered ADC Applications
1nF
1nF
A0 TO A4
AD8376
5
1/2
1µH
1µH
L1
390 nH
330 nH
270 nH
220 nH
301Ω
Rev. A | Page 17 of 24
1nF
1nF
L1
L1
C2
at dc, which introduces a zero into the transfer function. In
addition, the ac coupling capacitors and the bias chokes introduce
additional zeros into the transfer function. The final overall
frequency response takes on a band-pass characteristic, helping
to reject noise outside of the intended Nyquist zone. Table 5
provides initial suggestions for prototyping purposes. Some
empirical optimization may be needed to help compensate for
actual PCB parasitics.
L3
L3
C2
5.6 pF
3.3 pF
2.7 pF
2.2 pF
C4
CML
165Ω
165Ω
L3
390 nH
330 nH
270 nH
220 nH
L5
AD9246
AD9640
AD6655
C4
25 pF
20 pF
20 pF
18 pF
L5
100 nH
56 nH
39 nH
27 nH
AD8376