Features: `-4 to 20dB Gain Range
`1 dB Step Size ± 0.2 dB
`Differential input and output
150 Differential Input
Open Collector Differential Output
`8dB noise figure @ maximum gain
`OIP3 of ~50dBm at 140MHz
`−3 dB bandwidth of 690 MHz
`Parallel 5-bit Control Interface
`Wide input dynamic range
`Power-down feature
`Single 5V Supply Operation
`24 Lead LFCSP 4 x 4 mm Package
Application·Differential ADC drivers
·High IF Sampling Receivers
·High Output Power IF Amplification
·InstrumentationPinout
Specifications
| Parameter |
Rating |
Supply Voltage, VPOS
PWUP, A0, A1, A2, A3, A4
Input Voltage, VIN+ ,VIN-
Internal Power Dissipation
JA (Exposed paddle soldered down)
JA (Exposed paddle not soldered down)
JC (At exposed paddle)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range (Soldering 60 sec) |
5.5 V
-0.6 to (VPOS + 0.6V)
-0.6 to +3.1V
TBD mW
TBD/W
TBD/W
TBD/W
TBD
40 to +85
65 to +150
TBD |
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
| Gain Control |
Digital |
| -3 dB BW (MHz) |
690MHz |
| Gain Low End (dB) |
-4dB |
| Gain High End (dB) |
+20dB |
| Number of Channels |
1 |
| Supply Voltage (V) |
+5V |
| Supply Current |
130mA |
| Gain Accuracy (dB) |
±0.2dB |
DescriptionThe AD8375 is a digitally controlled, variable gain wide bandwidth amplifier that provides precise gain control, high IP3 and low noise figure. The excellent distortion performance and high signal bandwidth makes the AD8375 an excellent gain control device for a variety of receiver applications.
For wide input dynamic range applications, the AD8375 pro-vides a broad 24dB gain range with 1 dB resolution. The ain is adjusted through a 5-pin control interface and can be driven using standard TTL levels. The open-collector outputs rovide a flexible interface, allowing the overall signal gain to be set by the loading resistance. The AD8375 offers a aximum trans-conductance gain of 67 m-1's, resulting in a signal gain of 20dB when driving a 150-Ohm load. The maximum signal gain increases to ~24dB when driving a 250-Ohm differential load.Using a high speed SiGe process and incorporating proprietary distortion cancellation techniques, the AD8375 achieves 50 dBm output IP3 at 140 MHz.
The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is typically 130mA. When powered down, the AD8375 consumes less than 5mA and offers excellent input to output isolation. The gain setting is preserved when powered down.
Fabricated on an ADI's high speed SiGe process, the AD8375 provides precise gain adjustment capabilities with good distortion performance. The AD8375 amplifier comes in a compact, thermally enhanced 4 x 4mm 24-lead LFCSP package and operates over the temperature range of −40 to +85.
AD8375 Data Sheet
