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AD1671JP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
AD1671
REV. B
–12–
APPLICATIONS
AD1671 TO ADSP-2100A
Figure 16 demonstrates the AD1671 to ADSP-2100A interface.
The 2100A with a clock frequency of 12.5 MHz can execute an
instruction in one 80 ns cycle. The AD1671 is configured to
perform continuous time sampling. The DAV output of the
AD1671 is asserted at the end of each conversion. DAV can be
used to latch the conversion result into the two 574 octal
D-latches. The falling edge of the sampling clock is used to
generate an interrupt (IRQ3) for the processor. Upon interrupt,
the ADSP-2100A starts a data memory read by providing an
address on the DMA bus. The decoded address generates OE
for the latches and the processor reads their output over the
DMA bus. The conversion result is read within a single proces-
sor cycle.
+5V
ADSP-
2100A
DMA0:13
DMA0:15
DMACK
ADDRESS BUS
Q0:7
D0:7
574
OE
Q0:7
D0:7
574
OE
DATA BUS
D0:3
DAV
BIT1:12
ENCODE
16
8
4
8
4
DMRD
IRQ3
AD1671
SAMPLING
CLOCK
DECODE
8
Figure 16. AD1671 to ADSP-2100A Interface
AD1671 TO ADSP-2101/2102
Figure 17 is identical to the 2100A interface except the sam-
pling clock is used to generate an interrupt (IRQ2) for the pro-
cessor. Upon interrupt the ADSP-2100A starts a data memory
read by providing an address on the address (A) bus. The de-
code address generates OE for the D-latches and the processor
reads their output over the Data (D) bus. Reading the conver-
sion result is thus completed within a single processor cycle.
ADSP-2101
A0:13
D0:15
ADDRESS BUS
DECODE
Q0:7
D0:7
574
OE
Q0:7
D0:7
574
OE
DATA BUS
D0:3
16
8
4
8
8
4
RD
IRQ2
SAMPLING
CLOCK
DAV
BIT1:12
ENCODE
AD1671
Figure 17. AD1671 to ADSP-2101/ADSP-2102 Interface
AD1671
REV. B
–13–
COMPONENT LIST
Parts List Type
Reference Designator Description
R1, R2 Resistor, 5%, 0.5 W, 100 Ω
R3, R4, R5 Resistor, 1%, 49.9 Ω
R6 100 Ω Trim Potentiometer
R7 Resistor 1%, 4.99 kΩ Optional
R8 X Ω Trim Potentiometer, Optional
R9, R11 Resistor, 1%, 4.99 kΩ
R10 Resistor, 1%, 10 kΩ
R12 Resistor, 1%, 2.49 kΩ
R13 Resistor, 1%, 787 Ω
R14 Resistor, 1%, 249 Ω
R15–R28 Resistor, 5%, 22 Ω
C1, C3, C5 Cap, Tantalum, 22 µF
C2, C4, C6, C8, C10 Cap, Ceramic, 0.01 µF
C7, C9, C15, C16 Cap, Tantalum, 10 µF
C11, C12, C13, C14, C17 Cap, Ceramic, 0.1 µF
C18 Cap, Ceramic, 1.0 µF
C19–C22 Cap, Ceramic, 0.1 µF
C23 Cap, Mica, 100 pF
C24 Cap, Ceramic, 0.001 µF
U1 78L05 +5 V Regulator
U2 79L05 –5 V Regulator
U3 AD1671
U4–U5 74HC573 Drivers
U6 AD568
W1–W3 BNC Jacks
J1–J15 Jumpers and Headers
Metal Binding Posts
S1 Wide 28-Pin Socket
S2 Narrow 20-Pin Socket
S3 Narrow 24-Pin Socket
SW1–SW3 SECMA SPDT Switch
TP1, TP2, TP4–TP6 Test Point, Red
TP3, TP7, TP10, TP13 Test Point, Black
TP8, TP9, TP11, TP12, TP14 Test Point, White
P1 40-Pin Connector Male + Hooks
AD1671
REV. B
–14–
Figure 18. AD1671/EB PCB Layout—Silkscreen Layer
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

AD1671JP

Mfr. #:
Buy AD1671JP
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-BIT 125 MSPS
Lifecycle:
New from this manufacturer.
Delivery:
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