PGA870_10 Datasheet, PDF (1/26 Pages) Texas Instruments – High-Speed, Fully Differential, Programmable-Gain Amplifier

PGA870
PGA870
www.ti.com
SBOS436 – DECEMBER 2009
High-Speed, Fully Differential, Programmable-Gain Amplifier
Check for Samples: PGA870
FEATURES
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•23 Wideband +5-V Operation: 650-MHz Bandwidth
• Low Impedance, Voltage Mode Output
• Wide Gain Range: –11.5 dB to +20 dB
• Precise 0.5-dB Gain Steps
Step-to-Step Gain Error = ±0.03 dB
• HD₂: –93 dBc at 100 MHz
• HD₃: –88 dBc at 100 MHz
• IMD₃: –98 dBc at 100 MHz, –95 dBc at 200 MHz
• OIP3: +47 dBm at 100 MHz;
Exceeds +45 dBm for Frequencies to 300 MHz
• Flexible Gain Control Interface:
– Supports latched and unlatched options
– Gain may be set in power-down state
– Fast setup and hold times: 2.5 ns
• Low Disable Current: 2 mA
• Pb-Free (RoHS-Compliant) and Green Package
APPLICATIONS
• Programmable Gain IF Amplifier:
– Differential signal chains
– Single-ended to differential conversion
• Fast Gain Control Loops for:
– Test/measurement
– Digital radio signal chains
• ADC Driver for Wireless Base Station Signal
Chains: GSM, WCDMA, MC-GSM
• Radar/Ranging Systems
DESCRIPTION
The PGA870 is a wideband programmable-gain
amplifier (PGA) for high-speed signal chain and data
acquisition systems. The PGA870 has been
optimized to provide high bandwidth, low distortion,
and low noise, making it ideally suited as a 14-bit
analog-to-digital converter (ADC) driver for wireless
base station signal chain applications. The wide gain
range of –11.5 dB to +20 dB can be adjusted in
0.5-dB gain steps through a 6-bit control word applied
to the parallel interface. The gain control interface
may be configured as a level-triggered latch or an
edge-triggered latch, or it may be placed in an
unlatched (transparent) mode. In addition to the 6-bit
gain control, the PGA870 contains a power-down pin
(PD) that can be used to put the device into a
low-current, power-down mode. In this mode, the
quiescent current drops to 2 mA, but the gain control
circuitry remains active, allowing the gain of the
PGA870 to be set before device power-up. The
PGA870 is offered in a QFN-28 PowerPAD™
package.
DEVICE
THS4509
THS7700
THS9000
ADS6149
ADS6145
RELATED PRODUCTS
DESCRIPTION
Wideband, low-noise, low-distortion, fully
differential amplifier
High-speed, fully differential 16-bit ADC
driver
50-MHz to 400-MHz IF/RF Amplifier
14-Bit, 250-MSPS ADC with DDR
LVDS/CMOS Outputs
14-Bit, 125-MSPS ADC with DDR
LVDS/CMOS Outputs
Signal Source
+5 V
6b Gain Adjust
6b
6b
Programmable
Attenuator
PGA870
Control Logic
Fast Gain Control Loop
F_S = 250 MHz
Bandpass
Filter
ADS6149
Latch Mode 1
Powerdown 1
Gain Strobe 1
FPGA
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated