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參數資料
| 型號： | AD7840 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS Complete 14-Bit DAC |
| 中文描述： | LC2MOS完整的14位DAC |
| 文件頁數： | 13/16頁 |
| 文件大小： | 337K |
| 代理商： | AD7840 |
AD7840
REV. B
–13–
DAT A ACQUISIT ION BOARD
Figure 25 shows the AD7840 in a data acquisition circuit. T he
corresponding printed circuit board (PCB) layout and silkscreen
are shown in Figures 26 to 28. T he board layout has three inter-
face ports: one serial and two parallel. One of the parallel ports
is directly compatible with the ADSP-2100 evaluation board
expansion connector.
Some systems will require the addition of a re-construction filter
on the output of the AD7840 to complete the data acquisition
system. T here is a component grid provided near the analog
output on the PCB which may be used for such a filter or any
other output conditioning circuitry. T o facilitate this option,
there is a shorting plug (labeled LK 1 on the PCB) on the analog
output track. If this shorting plug is used, the analog output
connects to the output of the AD7840; otherwise this shorting
plug can be omitted and a wire link used to connect the analog
output to the PCB component grid.
T he board also contains a simple sample-and-hold circuit which
can be used on the output of the AD7840 to extend the very
good performance of the AD7840 over a wider frequency range.
A second wire link (labelled LK 2 on the PCB) connects V
OUT
(SK T 1) to either the output of this sample-and-hold circuit or
directly to the output of the AD7840.
INT E RFACE CONNE CT IONS
T here are two parallel connectors, labeled SK T 4 and SK T 6,
and one serial connector, labeled SK T 5. A shorting plug option
(LK 8 in Figure 25) on the AD7840
CS
/SERIAL input config-
ures the DAC for the appropriate interface (see Pin Function
Description).
SK T 6 is a 96-contact (3-row) Eurocard connector which is di-
rectly compatible with the ADSP-2100 Evaluation Board Proto-
type Expansion Connector. T he expansion connector on the
ADSP-2100 has eight decoded chip enable outputs labeled
ECE1
to
ECE8
.
ECE6
is used to drive the AD7840
CS
input
on the data acquisition board. T o avoid selecting on-board
sockets at the same time, LK 6 on the ADSP-2100 board must
be removed. T he AD7840 and ADSP-2100 data lines are
aligned for left justified data transfer.
SK T 4 is a 26-way (2-row) IDC connector. T his connector con-
tains the same signal contacts as SK T 6 and in addition contains
decoded R/
W
and
STRB
inputs which are necessary for
T MS32020 interfacing. T his decoded
WR
can be selected via
LK 4. T he pinout for this connector is shown in Figure 29.
SK T 5 is a nine-way D-type connector which is meant for serial
interfacing only. T he evaluation board has the facility to invert
SYNC
line via LK 7. T his is necessary for serial interfacing be-
tween the AD7840 and DSP processors such as the DSP56000.
T he SK T 5 pinout is shown in Figure 30.
SK T 1, SK T 2 and SK T 3 are three BNC connectors which pro-
vide connections for the analog output, the
LDAC
input and an
external reference input. T he use of an external reference is op-
tional; the shorting plug (LK 3) connects the REF IN pin to ei-
ther this external reference or to the AD7840’s own internal
reference.
Wire links LK 5 and LK 6 connect the D11 and D10 inputs to
the data lines for parallel operation. In the serial mode, these
links allow the user to select the required format and justifica-
tion for serial data (see T able I).
POWE R SUPPLY CONNE CT IONS
T he PCB requires two analog power supplies and one 5 V digi-
tal supply. Connections to the analog supplies are made directly
to the PCB as shown on the silkscreen in Figure 26. T he con-
nections are labelled V+ and V– and the range for both of these
supplies is 12 V to 15 V. Connection to the 5 V digital supply is
made through any of the connectors (SK T 4 to SK T 6). T he
–5 V analog supply required by the AD7840 is generated from
a voltage regulator on the V– power supply input (IC5 in
Figure 25).
SHORT ING PLUG OPT IONS
T here are eight shorting plug options which must be set before
using the board. T hese are outlined below:
LK 1
Connects the analog output to SK T 1. T he analog
output may also be connected to a component grid
for signal conditioning.
LK 2
Selects either the AD7840 V
OUT
or the sample-and-
hold output.
LK 3
Selects either the internal or external reference.
LK 4
Selects the decoded R/
W
and
STRB
inputs for
T MS32020 interfacing.
LK 5
Configures the D11/FORMAT input.
LK 6
Configures the D10/JUST IFY input.
LK 7
Selects either the inverted or noninverted
SYNC
.
LK 8
Selects either parallel or serial interfacing.
COMPONE NT LIST
IC1
IC2
IC3
IC4
IC5
IC6
C1, C3, C5, C7,
C11, C13, C15, C17
C2, C4, C6, C8,
C12, C14, C16, C18
C9
C10
R1, R2
R3
RP1, RP2
LK 1, LK 2, LK 3,
LK 4, LK 5, LK 6,
LK 7, LK 8
SK T 1, SK T 2, SK T 3
SK T 4
SK T 5
SK T 6
AD7840 Digital-to-Analog Converter
AD711 Op Amp
ADG201HS High Speed Switch
74HC221 Monostable
79L05 Voltage Regulator
74HC02
10
μ
F Capacitors
0.1
μ
F Capacitors
330 pF Capacitor
68 pF Capacitor
2.2 k
Resistors
15 k
Resistor
100 k
Resistor Packs
Shorting Plugs
BNC Sockets
26-Contact (2-Row) IDC Connector
9-Contact D-T ype Connector
96-Contact (3-Row) Eurocard
Connector
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