Analog Outputs; Digital Interface; Reference; Multiplexer Output - Analog Devices DC2904A-B User Manual

User Guide
EVALUATION BOARD HARDWARE

ANALOG OUTPUTS

The analog outputs, V to V
OUT0
E15, E16, E17, E18, E19, and E20 turrets, respectively. Return
paths for the ground currents are available on the E3 and E23
(GND) turrets. These turrets must be connected to load GND.

DIGITAL INTERFACE

DC2026C Connections
The DC2904A-B uses the DC2026C
evaluation software through the USB port on the DC2026C. Use
the provided ribbon cable to connect J1 of the DC2904A-B to J1
of the DC2026C. When this connection is made, the DC2026C
powers the electrically erasable programmable read only memory
(EEPROM) on the DC2904A-B. The ACE evaluation software uses
the EEPROM to identify the DC2904A-B and load the proper plugin.
To ensure proper serial transfers and compatibility, the DC2026C
powers the IOV pin of the LTC2686, which is nominally 5 V.
CC
DC2026C Connector Pin Descriptions
Figure 3 shows the pins for the
scriptions of each pin, see Table
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 DC2904A-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
analog.com
, are available on the E13, E14,
OUT7
to communicate with the
DC2026C J1 connector. For de-
1.
) for EEPROM
CC

REFERENCE

By default, the DC2904A-B uses the internal reference of the
LTC2686. To use an external reference, place the DC2904A-B JP1
(REF SEL) jumper into the EXT position and apply an external
reference to E11 (REF).

MULTIPLEXER OUTPUT

The LTC2686 has an internal multiplexer that allows monitoring of
compliance voltages, output currents, and internal die temperature.
The output compliance voltages and representative voltages of
ACE
the output current and internal die temperature are available on
the LTC2686 MUX pin and can be routed to the DC2904A-B E21
connector (MUX) using the LTC2686-16 Memory Map view in the
ACE GUI (see Figure
analog mux control register. Refer to the LTC2686 data sheet for
more details on the multiplexer functionality and register structure.

ON-BOARD CONNECTORS

Table 2 describes the on-board connectors on the DC2904A-B.
Table 2. On-Board Connectors
Connector
J1
JP1
JP2
JP3
JP4
JP5
E1
E2
E3, E6, E7, E12, E23
E4
E5
E8
E9
E10
E11
E13
E14
E15
E16
E17
E18
E19
E20
E21
E22
DC2904A
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+
V2+
V1+
GND
V−
IOVCC
CLR
LDAC
VCC
REF
Channel 0 voltage output (VOUT0)
Channel 1 voltage output (VOUT1)
Channel 2 voltage output (VOUT2)
Channel 3 voltage output (VOUT3)
Channel 4 voltage output (VOUT4)
Channel 5 voltage output (VOUT5)
Channel 6 voltage output (VOUT6)
Channel 7 voltage output (VOUT7)
MUX
FAULT
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