Electronic Design

Analog

2.5-V Micropower Op Amp Comes In SOT-23 Package
Microchip Technology Inc.
(480) 786-7200; fax (480) 899-9210; www.microchip.com

The MCP606 2.5-V micropower operational amplifier offers a significantly competitive offset voltage of less than 250 µV. This device is offered in the tiny SOT-23 package. It features a low supply current of 25 µA maximum. While single-supply operation ranges from 2.7 to 5.5 V, the low bias current of this device is 1 pA. The MCP606 is available in a single operational-amplifier configuration.

It features rail-to-rail swing at output as well as unity-gain stability. It is fully specified from −40°C to 85°C with power supplies from 2.7 to 5.5 V. Suitable applications include sensors, instrumentation, and battery-operated applications. It is an ideal solution for engineers who need low offset voltage, low supply current, and low-voltage operation in a small package. In 1000-unit quantities, the MCP606 costs $0.44 each.

14-Bit ADC Offers A Parallel Interface With Rates Up To 3 Msamples/s
Analog Devices Inc.
(800) ANALOG-D; fax (781) 937-1021; www.analog.com

The AD7484 is the fastest 14-bit successive approximation register (SAR) analog-to-digital converter (ADC) available. It offers a parallel interface with throughput rates up to 3 Msamples/s. The AD7482 is a 12-bit version of the device. These ADCs contain a low-noise, wide-bandwidth track/hold amplifier that can handle input frequencies in excess of 50 MHz.

Factory trimming ensures high dc accuracy. This configuration yields very low INL, offset, and gain errors. The ADCs use advanced design techniques to achieve low power dissipation (80 mW) at a high throughput rate of 3 Msamples/s. A NAP mode keeps reference circuitry active for quick power-up. STANDBY mode reduces power consumption to 5 µW. The AD7484 features an on-board 2.5-V reference and accommodates an external 2.5-V reference source. An 8% over-range capability is provided via a fifteenth bit. If the analog input range strays outside the nominal voltage or drops to as low as 200 mV below ground, the designer can still accurately resolve the signal. The AD7484 and AD7482 are packaged in 48-lead LQFP packages. In 1000-unit quantities, the AD7484 and AD7482 cost $19.00 and $7.00, respectively.

16-Bit Serial ADC Accepts Unipolar And Bipolar Inputs To ±10 V
Linear Technology Corp.
(408) 432-1900; fax (408) 434-6441; www.linear-tech.com

The LTC1609 is a serial 16-bit analog-to-digital converter (ADC) with a flexible input. This input can be configured for multiple or bipolar input ranges on a single 5-V supply. The ADC accepts bipolar inputs of ±10, ±5, and ±3.3 V. Unipolar inputs include 0 to 10 V, 0 to 5 V, and 0 to 4 V. Each range is guaranteed for 16 bits with no missing codes. Ranges are also guaranteed for ±2 LSB INL at a sample rate of up to 200 ksamples/s.

With the LTC1609, users are able to clock out the data using either the internal serial shift clock or an external shift clock. The device operates from a single 5-V supply while consuming only 65 mW. For power-sensitive applications, it offers a power-down mode in which the power dissipation drops to 50 µW. The LTC1609 also includes an internal reference that can be externally driven. It is available in 28-pin SSOP and SOIC packages. Additionally, it operates over the commercial and industrial temperature ranges.

Pricing for the LTC1609 analog-to-digital converter begins at $14.95 in 1000-unit quantities.

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