ADA4941-1: Single-Supply, Differential 18-Bit ADC Driver
The ADA4941-1 is a low power, low noise differential driver for ADCs up to 18 bits in systems that are sensitive to power. The ADA4941-1 is configured in an easy-to-use, single-ended-to-differential ...More
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ADA4941-1: Single-Supply, Differential 18-Bit ADC Driver
Product Description
The ADA4941-1 is a low power, low noise differential driver for ADCs up to 18 bits in systems that are sensitive to power. The ADA4941-1 is configured in an easy-to-use, single-ended-to-differential configuration and requires no external components for a gain of 2 configuration. A resistive feedback network can be added to achieve gains greater than 2. The ADA4941-1 provides essential benefits, such as low distortion and high SNR, that are required for driving high resolution ADCs.
With a wide input voltage range (0 V to 3.9 V on a single 5 V supply), rail-to-rail output, high input impedance, and a user-adjustable gain, the ADA4941-1 is designed to drive single-supply ADCs with differential inputs found in a variety of low power applications, including battery-operated devices and single-supply data acquisition systems.
The ADA4941-1 is ideal for driving the 16-bit and 18-bit PulSAR® ADCs such as the AD7687, AD7690 and AD7691.
The ADA4941-1 is manufactured on ADI's proprietary second-generation XFCB process, which enables the amplifier to achieve 18-bit performance on low supply currents.
The ADA4941-1 is available in a small 8-lead LFCSP as well as a standard 8-lead SOIC and is rated to work over the extended industrial temperature range, -40°C to +125°C.
Features
- Single-ended-to-differential converter
- Excellent linearity:
Distortion -110 dBc @ 100 kHz for
VOdm = 2 V p-p - Low noise: 10.2 nV/√Hz, output-referred,
G = 2 - Extremely low power
2.2 mA (3 V supply) - High input impedance: 24 MΩ
- User adjustable gain
- High speed: 31 MHz, −3 dB
bandwidth (G = +2) - Fast settling time:
300 ns to 0.005% for a 2 V step - Rail-to-rail output
- Disable feature
- Wide supply voltage range: 2.7 V to 12 V
- Available in space-saving packaging: 3 mm × 3 mm LFCSP
Verified Circuits Using This Part
Verified Circuits are designed for ease of use and proven to work by ADI applications engineers. To learn more about Verified Circuits from ADI, please visit Verified Circuits Home.
Diagrams
- Enlarge
- 原理图符号和PCB封装
Functional Block Diagram for ADA4941-1
Single-Supply, Differential 18-Bit ADC Driver
Functional Block Diagram for ADA4941-1
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| Part# | -3 dB BW (MHz) | Minimum Gain (Acl) | Voltage Supply (V) | Supply Current (max) | Slew Rate (V/us) | Distortion (2nd) (dBc) | Distortion (3rd) (dBc) | Package | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|
| AD6630 | 700 | - | +/- 5 | 30mA | 3700 | - | - | 16-Lead SOIC | $4.18 |
| AD8132 | 350 | 1 | +/- 5 | 10.7mA | 1200 | -97 | -100 | 8-Lead MSOP, 8-Lead SOIC | $1.67 |
| AD8137 | 110 | 1 | +/- 6 | 3.6mA | 450 | -85 | -85 | 8-Lead SOIC | $1.10 |
| AD8138 | 320 | 1 | +/- 5 | 20mA | 1500 | -94 | -114 | 8-Lead CSP, 8-Lead SOIC | $3.80 |
| AD8139 | 410 | 1 | 5 to 12 | 24.5mA | 800 | -90 | -105 | 8-Lead CSP, 8-Lead SOIC | $3.63 |
| AD8350 | 900 | - | 4 to 11 | 32mA | 2000 | -67 | -70 | 8-Lead SOIC/8-Lead uSOIC | $2.52 |
| AD8351 | 2200 | 1 | 3 to 5.5 | 32mA | 13000 | -79 | -81 | 10-Lead uSOIC | $2.68 |
| AD8352 | 2200 | - | 3 to 5.5 | 37mA | 11000 | -81 | -82 | 16-Lead LFCSP | $3.53 |
| ADA4922-1 | 38 | 1 | +/- 12 | 9.4mA | 730 | -116 | -109 | - | $3.63 |
| ADA4927-1 | 2300 | 1 | 4.5 to 11 | 22.1mA | 5000 | -87 | -89 | 16-Lead LFCSP | $3.79 |
| ADA4927-2 | 2300 | 1 | 4.5 to 11 | 22.1mA | 5000 | -87 | -89 | 24-Lead LFCSP | $6.29 |
| ADA4937-1 | 1900 | 1 | 3 to 5.25 | 39.5mA | 6000 | -70 | -84 | 16-Lead LFCSP | $3.84 |
| ADA4937-2 | 1900 | 1 | 3 to 5.25 | 42mA | 6000 | -77 | -84 | 16-Lead LFCSP, 24-Lead LFCSP | $5.76 |
| ADA4938-1 | 1000 | 1 | 4.5 to 11 | 40mA | 4700 | -82 | -82 | 16-Lead LFCSP, 24-Lead LFCSP | $3.84 |
| ADA4938-2 | 1000 | 1 | 4.5 to 11 | 36.5mA | 4700 | -82 | -82 | 16-Lead LFCSP, 24-Lead LFCSP | $5.76 |
| ADA4939-1 | 1400 | 2 | 3 to 5 | 37.7mA | 6800 | -77 | -95 | 16-Lead LFCSP | $3.84 |
| ADA4939-2 | 1400 | 2 | 3 to 5 |