下载
PGA870
Programmable
Attenuator
ControlLogic
PGA870
6b
6b
SignalSource
+5V
Bandpass
Filter
ADS6149
F =250MHz
S
Powerdown1
LatchMode 1
GainStrobe1
FPGA
6bGainAdjust
FastGainControlLoop
PGA870
www.ti.com
SBOS436A –DECEMBER 2009–REVISED FEBRUARY 2011
High-Speed, Fully Differential, Programmable-Gain Amplifier
Check for Samples: PGA870
1
FEATURES
DESCRIPTION
23
• Wideband +5-V Operation: 650-MHz Bandwidth
The PGA870 is a wideband programmable-gain
amplifier (PGA) for high-speed signal chain and data
• Low Impedance, Voltage Mode Output
acquisition systems. The PGA870 has been
• Wide Gain Range: –11.5 dB to +20 dB
optimized to provide high bandwidth, low distortion,
• Precise 0.5-dB Gain Steps
and low noise, making it ideally suited as a 14-bit
Step-to-Step Gain Error = ±0.03 dB
analog-to-digital converter (ADC) driver for wireless
base station signal chain applications. The wide gain
• HD
2
: –93 dBc at 100 MHz
range of –11.5 dB to +20 dB can be adjusted in
• HD
3
: –88 dBc at 100 MHz
0.5-dB gain steps through a 6-bit control word applied
• IMD
3
: –98 dBc at 100 MHz, –95 dBc at 200 MHz
to the parallel interface. The gain control interface
may be configured as a level-triggered latch or an
• OIP3: +47 dBm at 100 MHz;
edge-triggered latch, or it may be placed in an
Exceeds +45 dBm for Frequencies to 300 MHz
unlatched (transparent) mode. In addition to the 6-bit
• Flexible Gain Control Interface:
gain control, the PGA870 contains a power-down pin
– Supports latched and unlatched options
(PD) that can be used to put the device into a
low-current, power-down mode. In this mode, the
– Gain may be set in power-down state
quiescent current drops to 2 mA, but the gain control
– Fast setup and hold times: 2.5 ns
circuitry remains active, allowing the gain of the
• Low Disable Current: 2 mA
PGA870 to be set before device power-up. The
• Pb-Free (RoHS-Compliant) and Green Package
PGA870 is offered in a QFN-28 PowerPAD™
package.
APPLICATIONS
RELATED PRODUCTS
• Programmable Gain IF Amplifier:
DEVICE DESCRIPTION
– Differential signal chains
Wideband, low-noise, low-distortion, fully
– Single-ended to differential conversion
THS4509
differential amplifier
• Fast Gain Control Loops for:
THS7700 High-speed, fully differential 16-bit ADC driver
– Test/measurement
THS9000 50-MHz to 400-MHz IF/RF Amplifier
– Digital radio signal chains
14-Bit, 250-MSPS ADC with DDR
ADS6149
LVDS/CMOS Outputs
• ADC Driver for Wireless Base Station Signal
Chains: GSM, WCDMA, MC-GSM
ADS6145 14-Bit, 125-MSPS ADC with DDR
LVDS/CMOS Outputs
• Radar/Ranging Systems
ADS58C48 Quad channel IF receiver with SNRBoost 3G
1
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.
2PowerPAD is a trademark of Texas Instruments.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
© 2009–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
页面指南
