| Number of channels (#) | 1 |
| Total supply voltage (Min) (+5V=5, +/-5V=10) | 3.75 |
| Total supply voltage (Max) (+5V=5, +/-5V=10) | 5.25 |
| BW @ Acl (MHz) | 2000 |
| Acl, min spec gain (V/V) | 2 |
| Slew rate (Typ) (V/us) | 6400 |
| Architecture | Fully Differential ADC Driver, Bipolar |
| Vn at flatband (Typ) (nV/rtHz) | 2.3 |
| Iq per channel (Typ) (mA) | 39.2 |
| Rail-to-rail | In to V- |
| Vos (offset voltage @ 25 C) (Max) (mV) | 4 |
| Operating temperature range (C) | -40 to 85 |
| | |
| Output current (Typ) (mA) | 96 |
| 2nd harmonic (dBc) | 104 |
| 3rd harmonic (dBc) | 105 |
| Frequency of harmonic distortion measurement (MHz) | 10 |
| GBW (Typ) (MHz) | 3000 |
| Input bias current (Max) (pA) | 15500000 |
| Features | Shutdown, Decompensated |
| CMRR (Typ) (dB) | 90 |
| Rating | Catalog |
- Fully Differential Architecture
- Common-Mode Input Range Includes the
Negative Rail - Minimum Gain of 2 V/V (6 dB)
- Bandwidth: 2 GHz
- Slew Rate: 6400 V/μs
- 1% Settling Time: 2 ns
- HD2: -72 dBc at 100 MHz
- HD3: -79 dBc at 100 MHz
- OIP2: 78 dBm at 70 MHz
- OIP3: 42 dBm at 70 MHz
- Input Voltage Noise: 2.3 nV/√Hz (f > 10 MHz)
- Noise Figure: 19.2 dB (G = 10 dB)
- Output Common-Mode Control
- 5-V Power Supply Current: 39.2 mA
- Power-Down Capability: 0.65 mA
- APPLICATIONS
- 5-V Data-Acquisition Systems
- High Linearity ADC Amplifier
- Wireless Communication
- Medical Imaging
- Test and Measurement
The THS4508 is a wideband, fully-differential operational amplifier designed for single-supply 5-V data acquisition systems. It has very low noise at 2.3 nV/√Hz, and extremely low harmonic distortion of -72 dBc HD2 and -79 dBc HD3 at 100 MHz with 2 VPP, G = 10 dB, and 1-Ω load. Slew rate is very high at 6400 Vμs, and with settling time of 2 ns to 1% (2 V step), it is ideal for pulsed applications. It is designed for minimum gain of 6 dB, but is optimized for gain of 10 dB.
To allow for dc coupling to analog-to-digital converters (ADCs), its unique output common-mode control circuit maintains the output common-mode voltage within 5-mV offset (typical) from the set voltage, when set within 0.5 V of mid-supply. The common-mode set point is set to mid-supply by internal circuitry, which may be over-driven from an external source.
The THS4508 is a high-performance amplifier that has been optimized for use in high performance, 5-V single-supply data acquisition systems. The output has been optimized for best performance with its common-mode voltages set to mid-supply, and the input has been optimized for best performance with its common-mode voltage set to 0.7 V. High performance at a low power-supply voltage is ideal for high-performance, single-supply 5-V data-acquisition systems with a minimum parts count. The combined performance of the THS4508 in a gain of 10-dB driving the ADS5500 ADC, sampling at 125 MSPS, is 82-dBc SFDR, and 68.3-dBc SNR with a -1-dBFS signal at 70 MHz.
The THS4508 is offered in a quad 16-pin leadless QFN package (RGT), and is characterized for operation over the full industrial temperature range from -40°C to +85°C.
