-
AD8337: General-Purpose, Low Cost, DC-Coupled VGA Data Sheet (Rev. D)11/12/2009PDF954 K
Overview
Features and Benefits
- Low noise: Voltage noise = 2.2 nV/√Hz
Current noise = 4.8 pA/√Hz (positive input) - Wide bandwidth (−3 dB) = 280 MHz
- Nominal gain range: 0 dB to 24 dB (preamp gain = 6 dB)
- Gain scaling: 19.7 dB/V
- DC-coupled
- Single-ended input and output
- High speed uncommitted op amp input
- Supplies: +5 V, ±2.5 V, or ±5 V
- Low power: 78 mW with ±2.5 V supplies
Product Details
The AD8337 is a low noise, single-ended, linear-in-dB, general-purpose variable gain amplifier (VGA) usable at frequencies from dc to 100 MHz; the −3 dB bandwidth is 280 MHz. Excellent bandwidth uniformity across the entire gain range and low output-referred noise makes the AD8337 ideal for gain trim applications and for driving high speed analog-to-digital converters (ADCs).
Excellent dc characteristics combined with high speed make the AD8337 particularly suited for industrial ultrasound, PET scanners, and video applications. Dual-supply operation enables gain control of negative-going pulses such as generated by photodiodes or photomultiplier tubes.
The AD8337 uses the popular and versatile X-AMP® architecture, exclusively from Analog Devices, Inc., with a gain range of 24 dB. The gain control interface provides precise linear-in-dB scaling of 19.7 dB/V, referenced to VCOM.
The AD8337 includes an uncommitted operational current-feedback preamplifier (PrA) that operates in inverting or noninverting configurations. Using external resistors, the device can be configured for gains of 6 dB or greater. The AD8337 is characterized by a noninverting PrA gain of 2× using two external 100 Ω resistors. The attenuator has a range of 24 dB, and the output amplifier has a fixed gain of 8× (18.06 dB). The lowest nominal gain range is 0 dB to 24 dB and can be shifted up or down by adjusting the preamp gain. Multiple AD8337s can be connected in series for larger gain ranges, and for interstage filtering to suppress noise and distortion, and for nulling offset voltages.
The operating temperature range is –40°C to +85°C, and it is available in an 8-lead, 3 mm × 3 mm LFCSP.
Applications
- Gain trim
- PET scanners
- High performance AGC systems
- I/Q signal processing
- Video
- Industrial and medical ultrasound
- Radar receivers
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
FAQs7/26/2017
-
Variable Gain Amplifier Selection Table10/2/2008PDF68 kB
Tools & Simulations
SPICE Models
CIR
AD8337 SPICE Macro Model
2.11 K
Support & Discussions
AD8337 Discussions
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.