Analog Outputs; Digital Interface; Reference; Multiplexer Output - Analog Devices DC2873A User Manual

User Guide
EVALUATION BOARD HARDWARE

ANALOG OUTPUTS

The analog outputs, V to V
OUT0
E8, E9, E11, E12, E15, E16, E18, E19, E20, E21, E23, E25, E26,
and E27 turrets, respectively. Return paths for the ground currents
are available on the E4 and E30 (GND) turrets. These turrets must
be connected to load GND.

DIGITAL INTERFACE

DC2026C Connections
The DC2873A-B uses the DC2026C
evaluation software through the USB port on the DC2026C. Use
the provided ribbon cable to connect J1 of the DC2873A-B to J1
of the DC2026C. When this connection is made, the DC2026C
powers the electrically erasable programmable read only memory
(EEPROM) on the DC2873A-B. The ACE evaluation software uses
the EEPROM to identify the DC2873A-B and load the proper plugin.
To ensure proper serial transfers and compatibility, the DC2026C
powers the IOV pin of the LTC2688, which is nominally 5 V.
CC
DC2026C Connector Pin Descriptions
Figure 3 shows the pins for the DC2026C J1 connector. For de-
scriptions of each pin, see Table
1 3
2 4
Figure 3. DC2026C J1 Connector Pins
Table 1. DC2026C Connector J1 Pin Descriptions
Pin No. Mnemonic Description
1 V+ Unregulated voltage from the DC2026C,
nominally 7 V
2 VCCIO I/O voltage set by JP3 on the DC2026C
3 GND Ground
4 SCL/SCK Serial clock from the DC2026C
5 MISO Serial data from the DC2873A-B
6 CS Chip select from the DC2026C
7 SDA/MOSI Serial data from the DC2026C
8 GND Ground
9 EEDA Serial data for EEPROM
10 EEV Power supply (V
CC
11 EESCL Serial clock for EEPROM
12 EEGND Ground for EEPROM
13 GND Ground
14 NC No connection

REFERENCE

By default, the DC2873A-B uses the internal reference of the
LTC2688. To use an external reference, place the DC2873A-B JP1
analog.com
, are available on the E6, E7,
OUT15
to communicate with the
1.
5 7 9 11 13
6 8 10 12 14
) for EEPROM
CC
(REF SEL) jumper into the EXT position and apply an external
reference to E5 (REF).

MULTIPLEXER OUTPUT

The LTC2688 has an internal multiplexer that allows monitoring of
compliance voltages, output currents, and internal die temperature.
The output compliance voltages and representative voltages of
the output current and internal die temperature are available on
the LTC2688 MUX pin and can be routed to the DC2873A-B E28
connector (MUX) using the LTC2688-16 Memory Map view in the
ACE GUI (see Figure
ACE
analog mux control register. Refer to the LTC2688 data sheet for
more details on the multiplexer functionality and register structure.

ON-BOARD CONNECTORS

Table 2 describes the on-board connectors on the DC2873A-B.
Table 2. On-Board Connectors
Connector
J1
JP1
JP2
JP3
JP4
JP5
E1
E2, E4, E13, E17, E30
E3
E5
E6
E7
E8
E9
E10
E11
E12
E14
E15
E16
E18
E19
E20
E21
E22
E23
E24
E25
E26
E27
E28
E29
E31
UG-2001
8), and setting the appropriate bits in the
Function
2
SPI/I C interface pin header connector
Internal or external reference select
Toggle Pin 0 (TGP0)
Toggle Pin 1 (TGP1)
Toggle Pin 2 (TGP2)
Connect or disconnect V1+ and V2+
V1+
GND connections
V−
REF
Channel 0 voltage output (VOUT0)
Channel 1 voltage output (VOUT1)
Channel 2 voltage output (VOUT2)
Channel 3 voltage output (VOUT3)
IOVCC
Channel 4 voltage output (VOUT4)
Channel 5 voltage output (VOUT5)
V2+
Channel 6 voltage output (VOUT6)
Channel 7 voltage output (VOUT7)
Channel 8 voltage output (VOUT8)
Channel 9 voltage output (VOUT9)
Channel 10 voltage output (VOUT10)
Channel 11 voltage output (VOUT11)
CLR
Channel 12 voltage output (VOUT12)
LDAC
Channel 13 voltage output (VOUT13)
Channel 14 voltage output (VOUT14)
Channel 15 voltage output (VOUT15)
MUX
FAULT
VCC
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