MP8830
PIN OUT DEFINITIONS
Pin #
1, 44
Pin Name
DV
DD
(2)
Function
Digital positive power supplies. 5 V. Should be decoupled to digital GND plane. The two
DV
DD
pins both connect to the ESD ring as well as the control logic, data port logic, and the
internal ADC output data bus drivers.
Digital negative power supplies. 0 V. The two DGND pins both connect to the ESD ring as
well as the control logic and data port logic.
Analog positive power supplies. 5 V. Should be star connected to the analog supply post or
direct connection to analog supply plane. Decouple to AGND, BGND, CGND. V
DD
3 powers
the ADC internal logic only.
Analog negative power supplies. 0 V. Should be star connected to analog ground post or
direct connection to the analog ground plane. These GNDs power the analog sections of the
ADC and the circuitry in the DACs. GND3 pin connects to the internal ADC data bus and the
ADC internal logic.
Analog grounds related to DAC bias are the common voltage for the reference. The ADC
ladder resistor terminates to this pin as well as the internal bias resistor used for setting the
DAC reference. These pins should be used as the reference ground voltage for all analog
measurements.
Channel A data clock, active low. A DAC data loaded into first register bank on the falling
edge of AENL.
Channel B data clock, active low. B DAC data loaded into the first register on the falling edge
of BENL. B ADC data loaded to the ADC output port on falling edge (and should be read on
the rising edge).
Channel C data clock, active low. C DAC data loaded into the first register on the falling edge
of CENL. C ADC data loaded to the ADC output port on falling edge (and should be read on
the rising edge).
Cycle clock. All DACs loaded on rising edge. Begin sample of analog input on rising edge. A
ADC data is loaded to the ADC output port on the rising edge of CVL (and should be read on
the rising edge of AENL).
Pass through mode enable. When CREN is high, passthrough mode between the ADC and
DAC ports is enabled. RNW controls the direction of pass through operation.
READ not WRITE signal. RNW controls the direction of the pass through operation when
CREN is high and has no impact when CREN is low. When RNW is high data passes from
the DAC port to the ADC port. When RNW is low, data passes from the ADC port to the DAC
port. Note, the port connections are: CD5; AD0; CD6; AD1;......;CD14; AD9.
Analog mux control. V
IN
MX controls the analog mux on the input of all three ADCs. When
V
IN
MX is high, all ADC inputs are connected to VCAL. When low, each ADC is connected to
its particular analog input pin.
Fast mode enable. The FAST pin controls the mode of the ADCs. When low, the part func-
tions as specified for 10-bit resolution. When high, the ADC’s resolution becomes 4-bit and
the LSBs are forced low. The clock rate can be increased in this mode to 3 MHz.
Clamp voltage A. Black level clamp pin for the A channel.
Clamp voltage B. Black level clamp pin for the B channel.
Clamp voltage C. Black level clamp pin for the C channel.
Black level clamp control (active low). Black level clamp enable for all pins. All Black level
clamps are turned on when DCL is low.
A channel analog input.
B channel analog input.
C channel analog input.
Calibration input voltage.
43, 64
31
24
17
47
36
30
23
46
32
28
21
52
51
DGND (2)
AV
DD
,
BV
DD
,
CV
DD,
V
DD3
AGND1,
BGND1,
CGND1,
GND3
AGND2,
BGND2,
CGND2
AENL
BENL
50
CENL
53
CVL
48
49
CREN
RNW
39
V
IN
MX
45
FAST
37
29
22
41
35
27
20
38
ACLP
BCLP
CCLP
DCL
AAN
BAN
CAN
VCAL
Rev. 1.00
13
EXAR [ EXAR CORPORATION ]
