DSP201 Burr-Brown Corporation, DSP201 Datasheet - Page 13

• Manufacturer Part Number: DSP201
• Description: DSP-Compatible Single/Dual DIGITAL-TO-ANALOG CONVERTERS
• Manufacturer: Burr-Brown Corporation

APPLICATIONS
USING PARALLEL PORTS
WITH THE DSP201 OR DSP202
Figure 5 shows a circuit for converting parallel outputs into
the serial data stream required by the DSP201, and meets the
requirements for timing signals. Doubling this circuit allows
the DSP202 to be driven from a 32-bit parallel port. In most
applications, this circuit can be easily incorporated into gate
arrays or other programmed logic circuits already used in the
system, since the extra gate count is not high.
DEGLITCHING
Particularly in high resolution D/A converters, changing
input codes may cause glitching on the output that exces-
sively corrupts the dynamic purity of an output signal. The
DSP201 and DSP202 are designed to minimize output
glitching, and all of the performance specifications and
typical performance curves are based on tests with no extra
deglitching circuitry. In particular, the guaranteed Signal-to-
(Noise + Distortion) performance would be impossible to
attain with any significant glitching.
FIGURE 5. Driving the DSP201 from a 16-Bit Parallel Port.
PORTAO
WR
4
5
74LS32
6
D10
D11
D12
D13
D14
D15
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
MSB
LSB
18
17
14
13
18
17
14
13
8
7
4
3
8
7
4
3
8D
7D
6D
5D
4D
3D
2D
1D
CK
8D
7D
6D
5D
4D
3D
2D
1D
CK
74LS374
74LS374
11
11
OE
OE
8Q
7Q
6Q
5Q
4Q
3Q
2Q
1Q
8Q
7Q
6Q
5Q
4Q
3Q
2Q
1Q
1
1
1
19
16
15
12
9
6
5
2
19
16
15
12
9
6
5
2
74LS04
14
12
11
10
15
14
12
11
10
15
2
5
4
3
2
1
5
4
3
2
1
13
H
G
F
E
D
C
B
A
S/L
SI
H
G
F
E
D
C
B
A
S/L
SI
C
C
74LS166
74LS166
7
7
COMPLETE ANALOG INPUT/OUTPUT SYSTEM
The DSP201 or DSP202 can be paired with the Burr-Brown
DSP101 or DSP102 analog-to-digital converter to provide
both analog input and analog output for a complete digital
signal processing system. The DSP101 and DSP102 are
respectively single and dual channel 200kHz sampling A/Ds
with easy to use interfacing logic that complement the
DSP201 and DSP202. Figure 6 shows a single channel
analog input and output system based on a DSP201 and a
DSP101, and the minimal connections required to interface
to a DSP IC. A pair of channels can be implemented using
a single DSP202 and a single DSP102, either with two
separate DSP ICs, with a single DSP IC with dual serial
input and output channels, or a single DSP IC capable of 32-
bit words in the Cascade Mode.
For maximum flexibility in system design, the DSP201 or
DSP202 D/As can be updated at a different rate than the
conversion rate used on the DSP101 or DSP102 A/Ds, and
either or both of these rates can be asynchronous to the
clocks used with the DSP IC.
CI CL
CI CL
6
6
QH
QH
9
9
13
13
+5V
+5V
Clock
TTL
Bit
DSP201/202
11
13
12
15
10
+5V
9
SYNC
SIN
XCLK
CONV
SSF
SWL
DSP201
VOUT
21
±3V
Analog
Output
®