Six-Input Channel a Analog Front End AD73360 FEATURES metering or multichannel analog inputs. It features six 16-bit Six 16-Bit A/D Converters A/D conversion channels each of which provide 77 dB signal-to- Programmable Input Sample Rate noise ratio over a dc to 4 kHz signal bandwidth. Each channel Simultaneous Sampling also features a programmable input gain amplifier (PGA) with 77 dB SNR gain settings in eight stages from 0 dB to 38 dB. 64 kS/s Maximum Sample Rate The AD73360 is particularly suitable for industrial power me- 83 dB Crosstalk tering as each channel samples synchronously, ensuring that there Low Group Delay (25 s Typ per ADC Channel) is no (phase) delay between the conversions. The AD73360 also Programmable Input Gain features low group delay conversions on all channels. Flexible Serial Port which Allows Multiple Devices to An on-chip reference voltage is included and is programmable Be Connected in Cascade to accommodate either 3 V or 5 V operation. Single (+2.7 V to +5.5 V) Supply Operation 80 mW Max Power Consumption at +2.7 V The sampling rate of the device is programmable with four On-Chip Reference separate settings offering 64 kHz, 32 kHz, 16 kHz and 8 kHz 28-Lead SOIC and 44-Lead TQFP Packages sampling rates (from a master clock of 16.384 MHz). APPLICATIONS A serial port (SPORT) allows easy interfacing of single or cas- General Purpose Analog Input caded devices to industry standard DSP engines. The SPORT Industrial Power Metering transfer rate is programmable to allow interfacing to both fast Motor Control and slow DSP engines. Simultaneous Sampling Applications The AD73360 is available in 28-lead SOIC and 44-lead TQFP packages. GENERAL DESCRIPTION The AD73360 is a six-input channel analog front-end processor for general purpose applications including industrial power FUNCTIONAL BLOCK DIAGRAM VINP1 ANALOG SIGNAL 0/38dB - DECIMATOR SDI CONDITIONING PGA MODULATOR VINN1 SDIFS VINP2 SCLK ANALOG SIGNAL 0/38dB - DECIMATOR CONDITIONING PGA MODULATOR VINN2 VINP3 ANALOG SIGNAL 0/38dB - DECIMATOR CONDITIONING PGA MODULATOR VINN3 RESET REFERENCE REFCAP SERIAL AD73360 I/O MCLK REFOUT PORT SE VINP4 ANALOG SIGNAL 0/38dB - DECIMATOR CONDITIONING PGA MODULATOR VINN4 VINP5 ANALOG SIGNAL 0/38dB - DECIMATOR CONDITIONING PGA MODULATOR SDO VINN5 SDOFS VINP6 ANALOG SIGNAL 0/38dB - DECIMATOR CONDITIONING PGA MODULATOR VINN6(AVDD = 3 V 10% DVDD = 3 V 10% DGND = AGND = 0 V, f = 16.384 MHz, MCLK 1 AD73360SPECIFICATIONS f = 8.192 MHz, f = 8 kHz T = T to T , unless otherwise noted.) SCLK S A MIN MAX AD73360A Parameter Min Typ Max Unit Test Conditions/Comments REFERENCE REFCAP Absolute Voltage, V 1.125 1.25 1.375 V 5VEN = 0 REFCAP REFCAP TC 50 ppm/C 0.1 F Capacitor Required from REFCAP to AGND2 REFOUT Typical Output Impedance 130 Absolute Voltage, V 1.125 1.25 1.375 V Unloaded REFOUT Minimum Load Resistance 1 k Maximum Load Capacitance 100 pF ADC SPECIFICATIONS 2, 3 Maximum Input Range at VIN 1.644 V p-p 5VEN = 0, Measured Differentially 2.85 dBm Nominal Reference Level at VIN 1.1413 V p-p 5VEN = 0, Measured Differentially (0 dBm0) 6.02 dBm Absolute Gain PGA = 0 dB 0.8 +0.8 dB 1.0 kHz PGA = 38 dB 0.8 +0.8 dB 1.0 kHz Gain Tracking Error 0.1 dB 1.0 kHz, +3 dBm0 to 50 dBm0 Signal to (Noise + Distortion) PGA = 0 dB 73 77 dB 0 Hz to 4 kHz f = 8 kHz S PGA = 38 dB 62 dB 0 Hz to 4 kHz f = 64 kHz S Total Harmonic Distortion PGA = 0 dB 83 76 dB PGA = 38 dB 70 dB Intermodulation Distortion 76 dB PGA = 0 dB Idle Channel Noise 70 dB PGA = 0 dB Crosstalk ADC-to-ADC 83 dB ADC1 Input Signal Level: 1.0 kHz ADC2 Input at Idle DC Offset 30 +10 +45 mV PGA = 0 dB Power Supply Rejection 55 dB Input Signal Level at AVDD and DVDD Pins 1.0 kHz, 100 mV p-p Sine Wave 4, 5 Group Delay 25 s 64 kHz Output Sample Rate 50 s 32 kHz Output Sample Rate 95 s 16 kHz Output Sample Rate 190 s 8 kHz Output Sample Rate 2, 4 6 Input Resistance at VIN 25 k DMCLK = 16.384 MHz FREQUENCY RESPONSE 7 (ADC) Typical Output Frequency (Normalized to f ) S 00dB 0.03125 0.1 dB 0.0625 0.25 dB 0.125 0.6 dB 0.1875 1.4 dB 0.25 2.8 dB 0.3125 4.5 dB 0.375 7.0 dB 0.4375 9.5 dB > 0.5 < 12.5 dB 2 REV. B