Overview
The PGA870IRHDR, produced by Texas Instruments, is a high-speed, fully differential, programmable gain amplifier (PGA) designed for high-speed signal chain and data acquisition systems. This device operates on a 5-V supply and features a wideband performance with a bandwidth of 650 MHz. It is particularly suited for applications requiring low impedance, voltage mode output, and flexible gain control.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Bandwidth (G = 20 dB, VO = 100 mVPP) | - | 650 | - | MHz |
| Bandwidth (G = 20 dB, VO = 2 VPP) | - | 650 | - | MHz |
| Slew Rate (differential, 2-V step) | - | 2900 | - | V/μs |
| Rise Time (2-V step) | - | 0.55 | - | ns |
| Fall Time (2-V step) | - | 0.55 | - | ns |
| Settling Time to 1% (2-V step) | - | 3 | - | ns |
| Settling Time to 0.1% (2-V step) | - | 5 | - | ns |
| Gain Range | -11.5 | - | +20 | dB |
| Gain Step Size | - | 0.5 | - | dB |
| Quiescent Current | 136 | 143 | 150 | mA |
| Power-Down Quiescent Current | 2 | - | 4.8 | mA |
| Package Type | - | - | - | QFN-28 PowerPAD™ |
Key Features
- Wideband operation with a bandwidth of 650 MHz
- Low impedance, voltage mode output
- Wide gain range from –11.5 dB to +20 dB in 0.5 dB steps
- Flexible gain control interface supporting latched and unlatched options
- Fast setup and hold times: 2.5 ns
- Low disable current: 2 mA in power-down mode
- Pb-Free (RoHS-Compliant) and Green Package
- Power-down feature with active gain control circuitry
Applications
- Programmable Gain IF Amplifier in differential signal chains
- Single-ended to differential conversion
- Fast Gain Control Loops for test/measurement and digital radio signal chains
- ADC Driver for Wireless Base Station Signal Chains (GSM, WCDMA, MC-GSM)
- Radar/Ranging Systems
Q & A
- What is the bandwidth of the PGA870IRHDR?
The PGA870IRHDR has a bandwidth of 650 MHz for both small-signal and large-signal operations.
- What is the gain range of the PGA870IRHDR?
The gain range is from –11.5 dB to +20 dB, adjustable in 0.5 dB steps.
- What is the quiescent current of the PGA870IRHDR?
The quiescent current is typically 143 mA, with a range of 136 mA to 150 mA over the operating temperature range.
- How does the power-down feature work?
The PGA870IRHDR has a power-down pin (PD) that can put the device into a low-current mode (2 mA) while keeping the gain control circuitry active.
- What is the package type of the PGA870IRHDR?
The device is offered in a QFN-28 PowerPAD™ package.
- What are the typical slew rate and settling times of the PGA870IRHDR?
The slew rate is 2900 V/μs, and the settling time to 1% is 3 ns, with a settling time to 0.1% of 5 ns.
- Is the PGA870IRHDR RoHS-compliant?
- What are some common applications of the PGA870IRHDR?
- How does the gain control interface work?
- What is the common-mode rejection ratio (CMRR) of the PGA870IRHDR?
