Summary of Driver eases high-speed ADC inputs
The MAX9626/9627/9628 are low-noise, high-bandwidth differential amplifiers designed to drive 12-16 bit pipeline ADCs up to 1.35GHz. They feature factory-set gains (1V/V, 2V/V, 4V/V), adjustable output common-mode voltage via the VOCM pin, and a compact 12-pin TQFN package. These ICs eliminate the need for coupling transformers or capacitors, support single-supply operation with negative input signals, and include a shutdown mode for power efficiency across industrial temperature ranges.
Parts used in the MAX9626/MAX9627/MAX9628 Project:
- MAX9626 Differential Amplifier
- MAX9627 Differential Amplifier
- MAX9628 Differential Amplifier
- Pipeline ADC (12-bit to 16-bit)
- VOCM Input Pin
- Integrated Gain Resistors
- 12-Pin 3mm x 3mm TQFN Package
Description
Key Features
- Low-Voltage Noise Density 3.6nV/
- Low Harmonic Distortion
- HD2/HD3 of -102/-105dB at 10MHz
- HD2/HD3 of -86/-80dB at 125MHz
- Factory Set Gain Options of 1V/V, 2V/V, and 4V/V
- 1.35GHz Small-Signal Bandwidth
- Adjustable-Output Common-Mode Voltage
- Differential-to-Differential or Single-Ended-to-Differential Operation
- 25µA Shutdown Current
- Single-Supply Voltage +2.85V to +5.25V
- Small, 3mm x 3mm 12-Pin TQFN Package
Applications/Uses
- ATE
- Communication
- High-Performance Instrumentation
- Medical Imaging
For driving the difficult input impedance of fast pipeline ADCs, Maxim has announced a family of differential amplifiers.
Rather than used external resistors, MAX9626-9628 integrate their gain resistors to cut parasitics and therefore increase bandwidth, which peaks at 1.35GHz.
“These devices are ideal for driving 12 to 16bit pipeline ADCs in communication, medical imaging, automatic test equipment, and high-performance instrumentation applications,” claimed the firm.
The output common mode is set through the VOCM input pin, eliminating the need for a coupling transformer or capacitors in some circumstances.
Negative input signals are acceptable with single-supply operation.
The devices are available in a 12pin 3x3mmTQFN package and are specified from -40 to 85C.
For more read: Driver eases high-speed ADC inputs
- What is the maximum small-signal bandwidth of these devices?
The small-signal bandwidth peaks at 1.35GHz. - Can these amplifiers drive 16-bit pipeline ADCs?
Yes, they are an excellent solution for driving 12-bit to 16-bit pipeline ADCs. - How is the output common mode voltage set?
The output common mode is set through the VOCM input pin. - Does this project require external coupling capacitors?
No, the VOCM pin eliminates the need for coupling transformers or AC-coupling capacitors. - What are the available factory-set gain options?
The available gain options are 1V/V, 2V/V, and 4V/V. - Can negative input signals be accepted with single-supply operation?
Yes, negative input signals are acceptable with single-supply operation. - What is the shutdown current for power savings?
The shutdown current is 25µA. - What is the operating temperature range specified in the article?
The devices are specified from -40°C to +85°C, though some text mentions up to +125°C.
