Texas Instruments DAC8881, Руководство пользователя, Страница: 10 / 25

EVM Operation
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Table 1. Parts List (continued)
Item Qty. Designators Description Manufacturer Mfg. Part Number
9 2 J2 J4 (Top Side)
(1)
10 pin, dual row, TH header (20 pos.) Samtec TSM-110-01-T-DV-P
10 1 J6 (Top Side)
(1)
5 pin, dual row, TH header (10 pos.) Samtec TSM-105-01-T-DV-P
11 2 P2 P4 (Bottom Side)
(1)
10 pin, dual row, TH header (20 pos.) Samtec SSW-110-22-F-D-VS-K
12 1 P6 (Bottom Side)
(1)
5 pin, dual row, TH header (10 pos.) Samtec SSW-105-22-F-D-VS-K
13 1 R13 Resistor, 100 Ω , 0603, 1/4 W Yageo America 9C06031A1000JLHFT
14 6 R1 R2 R3 R4 R8 R20 Resistor, 0 Ω , 0603 Yageo America 9C06031A0R00JLHFT
15 2 R23 R26 Resistor, 49.9 Ω 1/10W 1% 0603 SMD Panasonic ERJ-3EKF49R9V
16 2 R21 R24 Resistor, 2 k Ω , 0603, Yageo America 9C06031A2001JLHFT
17 1 R9 Resistor, 20 k Ω , 32X4W Bourns 3214W-1-203E
18 10 R6 R10 R11 R12 R14 R15 Resistor, 10 k Ω , 0603 Yageo America 9C06031A1002JLHFT
R16 R17 R18 R19
19 1 R22 Resistor, 95.3
Ω
, 0603 SMD Panasonic ERJ-3EKF95R3V
20 8 TP1 TP2 TP3 TP4 TP5 Test point turret Mill-Max 2348-2-00-01-00-00-07-
TP6 TP7 TP8 0
21 1 U1 16-bit, buffered voltage output DAC Texas Instruments DAC8881SRGET
22 1 U2 High precision op-amp Texas Instruments OPA211AIDR
23 1 U3 5V precision voltage reference Texas Instruments REF5050AID
24 1 U4 High precision dual op-amp Texas Instruments OPA2277UA
25 1 U5 High precision, op-amp Texas Instruments OPA277UA
26 10 W1 W2 W4 W5 W6 W7 W8 3 pin mini header Samtec TMMH-103-01-T-T
W9 W10 W11
27 2 W3 W12 2 pin mini header Samtec TMMH-102-01-T-T
28 10 Shunt 2mm shunt – black Samtec 2SN-BK-G
29 0 R5 R7 R25
(2)
DNP – –
30 1 Shunt 0.100 shunt – black Samtec SNT-100-BK-T
(1)
P2, P4, and P6 parts are not shown in the schematic diagram. All P designated parts are installed on the bottom side of the PC board
opposite the J designated counterpart. Example, J2 is installed on the top side while P2 is installed on the bottom side opposite of J2.
(2)
Do NOT install the following: R5, R7, and R25.
3 EVM Operation
This chapter describes in detail the operation of the EVM to provide guidance to the user in evaluating the
on-board DAC and how to interface the EVM to a specific host processor.
Refer to the DAC8881 data sheet, ( SBAS422 ) for information about its serial interface and other related
topics.
The EVM board is factory tested and configured to operate in the unipolar output mode.
3.1 Factory Default Settings
The EVM board is set to its default configuration from the factory to operate in un5V mode of
operation as described in
Table 2 . Figure 10 shows the default jumper configuration as described in
Table 2 for the DAC8881.
Table 2. Factory Default Jumper Settings
Jumper
Reference Function
Position
W1 1-2 The +5VA is used for AV
DD
and DV
DD
to power the analog and digital supplies of the DAC8881.
W2 1-2 Routes V
OUT
of the DAC8881 to J4-2 for analog output monitoring.
W3 OPEN Disconnects V
REF
H from the inverting input of U2 for other output mode of configuration.
W4 2-3 Connects the V
REF
L pin of the DAC8881 to ground.
10 DAC8881 Evaluation Module SLAU257A – September 2008 – Revised November 2009
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