Datasheet Analog Devices AD73360ARZ — Datenblatt

a Six-Input Channel
Analog Front End
AD73360 FEATURES
Six 16-Bit A/D Converters
Programmable Input Sample Rate
Simultaneous Sampling
77 dB SNR
64 kS/s Maximum Sample Rate
–83 dB Crosstalk
Low Group Delay (25 ␮s Typ per ADC Channel)
Programmable Input Gain
Flexible Serial Port which Allows Multiple Devices to
Be Connected in Cascade
Single (+2.7 V to +5.5 V) Supply Operation
80 mW Max Power Consumption at +2.7 V
On-Chip Reference
28-Lead SOIC and 44-Lead TQFP Packages metering or multichannel analog inputs. It features six 16-bit
A/D conversion channels each of which provide 77 dB signal-tonoise ratio over a dc to 4 kHz signal bandwidth. Each channel
also features a programmable input gain amplifier (PGA) with
gain settings in eight stages from 0 dB to 38 dB. APPLICATIONS
General Purpose Analog Input
Industrial Power Metering
Motor Control …

= AD73360 Rev. 1
Errata Document A. This document details the limitations of the cascading option of the AD73360 due to a bug in the current silicon.
B. Analog Devices Inc. is committed, through future silicon revisions to continuously improve silicon functionality.
Analog Devices Inc. will use its best endeavors to ensure that these future silicon revisions remain compatible with your
present software/systems implementing the recommended work-arounds outlined in this document.
Background The AD73360 has the option of being cascaded allowing additional analog input channels to be easily be added as required. Due to a bug in the present silicon there are limitations on how many devices can be cascaded together and is
also dependent on the sample rate and serial clock rate used.
Issue Description When a number of AD73360s are cascaded together they each output ADC channel data in a time-division multiplexed
(TDM) format. For a cascade of N devices with all channels enabled the output sequence read by a DSP or Micro-controller would be A
T
T
A
N
R
E
ER UM
C
O
D Device N - Channel 1, Device N-1 -Channel 1… Device 1 -Channel 1, Device N -Channel 2, Device N-1 - Channel 2 … Device 1 - Channel 2…,
…, Device N - Channel 6, Device N-1 - Channel6 …, Device 1 - Channel 6 As each device is programmed with the number of devices in the cascade it should therefore allow sufficient SCLKs for
all other devices to transmit the ADC result of one channel before starting to transmit the next. For example in a cascade
of two devices, Device 1 will transmit its Channel 1 result to Device 2 in 16 SCLK cycles. At the same time Device 2 is
transmitting its Channel 1 result to the DSP or Microcontroller. Device 1 will then allow 16 SCLKs, when it does not …