Datasheet

ADuC7060/ADuC7061 Data Sheet
Rev. D | Page 38 of 108
ADC CIRCUIT INFORMATION
IEXC0
IEXC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC8
ADC9
GND_SW
50Ω
BUF
Σ-∆
MODULATOR
PROGRAMMABLE
FILTER
Σ-∆
MODULATOR
PROGRAMMABLE
FILTER
OVERRANGE
INTERFACE
AND CONTROL
CHOP
MUX
CHOP
MUX
AGND
TEMPERATURE
SENSOR
INTEGRATOR
ACCUMULATOR
CONVERSION
COUNTER
COMPARATORS
TO ARM
0.2Hz TO 8kHz
0.5Hz TO 8kHz
DAC
BUF
INTERNAL
REFERENCE
AVDD
AUX_REFP
AUX_REFM
0.2mA TO 1mA
PGA
50µA O/C
DETECT
V
REF–
V
REF+AVDD
ADC0
ADC1
DAC0
07079-009
Figure 14. Analog Block Diagram
The ADuC706x incorporates two independent multichannel
Σ-Δ ADCs. The primary ADC is a 24-bit, 4-channel ADC. The
auxiliary ADC is a 24-bit Σ-Δ ADC, with up to seven single-
ended input channels.
The primary ADC input has a mux and a programmable gain
amplifier on its input stage. The mux on the primary channel
can be configured as two fully differential input channels or as
four single-ended input channels.
The auxiliary ADC incorporates a buffer on its input stage.
Digital filtering is present on both ADCs, which allows
measurement of a wide dynamic range and low frequency
signals such as those in pressure sensor, temperature sensor,
weigh scale, or strain gage type applications.
The ADuC706x auxiliary ADC can be configured as four fully
differential input channels or as seven single-ended input
channels.
Because of internal buffering, the internal channels can convert
signals directly from sensors without the need for external
signal conditioning.