ADA4939-2: Ultralow Distortion Differential ADC Driver
The ADA4939 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The ...続きを見る
ADA4939-2: Ultralow Distortion Differential ADC Driver
製品概要
The ADA4939 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4939 output to match the input of the ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.
With the ADA4939, differential gain configurations are easily realized with a simple external feedback network of four resistors that determine the closed-loop gain of the amplifier.
The ADA4939 is fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.3 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4939 make it well suited for a wide variety of data acquisition and signal processing applications.
The ADA4939 is available in a Pb-free, 3 mm × 3 mm 16-lead LFCSP (ADA4939-1, single) or a Pb-free, 4 mm × 4 mm 24-lead LFCSP (ADA4939-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4939-1 and the ADA4939-2 are specified to operate over the −40°C to +105°C temperature range; both operate on supplies between 3.3 V and 5 V.
Applications
Data Sheet, Rev. 0, 5/08
Features
- Extremely low harmonic distortion
−102 dBc HD2 @ 10 MHz
−83 dBc HD2 @ 70 MHz
−77 dBc HD2 @ 100 MHz
−101 dBc HD3 @ 10 MHz
−97 dBc HD3 @ 70 MHz
−91 dBc HD3 @ 100 MHz - Low input voltage noise: 2.3 nV/√Hz
- High speed
−3 dB bandwidth of 1.4 GHz, G = 2
Slew rate: 6800 V/μs, 25% to 75%
Fast overdrive recovery of <1 ns
- ±0.5 mV typical offset voltage
- Externally adjustable gain
- Stable for differential gains ≥2
- Differential-to-differential or single-ended-to-differential operation
- Adjustable output common-mode voltage
- Single-supply operation: 3.3 V to 5 V
Diagrams
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- シンボル＆フットプリント
Functional Block Diagram
Ultralow Distortion Differential ADC Driver
Functional Block Diagram for ADA4939-2
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ADA4939-1 - Ultralow Distortion Differential ADC Driver
| 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 |
| 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 | 37.7mA | 6800 | -77 | -91 | 16-Lead LFCSP | $5.76 |
| ADA4941-1 | 30 | 2 | - | 2.3mA | 22 | -75 | -71 | 8-Lead LFCSP, 8-Lead SOIC | $2.42 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.