Date: 26/05/2009
200 kSPS, 8-channel, simultaneous sampling ADCs for power monitoring apps
Analog Devices has released two new simultaneous-sampling ADCs (analog-to-digital converters) AD7606 (16-bit) and AD7607 (14-bit) for use in power-line-monitoring systems.
Electric utility companies are increasingly using electronic smart grid and energy monitoring systems to keep their systems automated so that power grids are efficiently managed/controlled. These ADC are addressed for such systems by having the special feature of sampling inputs simultaneously to preserve the relative phase information of the signals on the input channels such as three-phase I&V (current and voltage) measurement and neutral monitoring in substation equipment.
The two notable features are,
Both these ADCs have signal-scaling amplifiers providing 10-kHz input bandwidth (-3-dB), and 1 M analog input impedance with 0.1% gain error, and 0.01% offset error.
They also integrate a front-end, anti-alias filter with attenuation of approximately 40 dB while sampling at a throughput rate up to 200 kSPS. The conversion process and data acquisition are controlled using CONVST signals and an internal oscillator. Two CONVST pins allow the simultaneous sampling of all eight analog inputs or two groups of four analog input channels to allow for phase differences between transformers.
The other common features and specifications of these ADCs are, True bipolar analog input ranges: ±10 V, ±5 V; Single 5V Analog Supply, 1.8V to +5V VDRIVE; 1MO Analog Input Impedance; Analog Input Clamp Protection; Over-sampling capability with digital filter; Low power consumption: 100 mW typ at 200 kSPS.
Signal to Noise Ratio (SNR) Typical at 200ksps for AD7606 is 90dB for AD7607 is 84.5dB.
The other on-chip functions include LDOs (low-drop-out regulators), a reference and reference buffer, track-and-hold circuitry, signal-conditioning circuitry, on-chip conversion clock, and high-speed parallel and serial interfaces.
"ADI's new simultaneous-sampling ADCs provide the resolution and performance needed for next-generation power-line-monitoring system designs that ensure the reliable delivery of electricity to millions of people in nearly every corner of the world," said Leo McHugh, product line director, precision signal processing, Analog Devices. "ADI offers a broad range of semiconductor solutions that solve design challenges in every part of the energy monitoring system, ranging from the electricity meter to the substation."
Package: 64-lead LQFP
Availability: Now in samples
Price: AD7606: Each $23.10 for 1K pieces
AD7607: Each $18.48 for 1K pieces
For further info visit http://www.analog.com/pr/AD7606 or http://www.analog.com/pr/AD7607