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PDF ADS117 Data sheet ( Hoja de datos )
| Número de pieza | ADS117 | |
| Descripción | Low-Power Sampling A/D Converters | |
| Fabricantes | Datel | |
| Logotipo |  |
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FEATURES
• 12-bit resolution
• No missing codes
• 2MHz minimum throughput
• Functionally complete
• Small 24-pin DDIP
• Low-power, 1.6 Watts
• Three-state output buffers
• Samples to Nyquist frequencies
GENERAL DESCRIPTION
DATEL's ADS-117 is a functionally complete, 12-bit, 2MHz,
sampling A/D converter. Its standard, 24-pin, double-width
DIP contains a fast-settling sample-hold amplifier, a 12-bit
subranging (two-step) A/D converter, a precision reference,
three-state output register and all the timing and control logic
necessary to operate from a single start convert pulse. Digital
input and output levels are TTL.
Total harmonic distortion (THD) and signal-to-noise ratio
(including distortion) typically run –78dB and 70dB,
respectively, with full scale inputs up to 100kHz. The ADS-
117 requires ±15V and +5V power supplies and typically
consumes 1.6 Watts. Models are available for use in either
commercial (0 to +70°C) or military (–55 to +125°C) operating
temperature ranges.
ADS-117
12-Bit, 2MHz, Low-Power
Sampling A/D Converters
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 12 (LSB)
2 BIT 11
3 BIT 10
4 BIT 9
5 BIT 8
6 BIT 7
7 BIT 6
8 BIT 5
9 BIT 4
10 BIT 3
11 BIT 2
12 BIT 1 (MSB)
24 –15V SUPPLY
23 ANALOG GROUND
22 +15V SUPPLY
21 +10V REFERENCE
20 BIPOLAR
19 ANALOG INPUT
18 COMP BIN
17 ENABLE (1-12)
16 START CONVERT
15 EOC
14 DIGITAL GROUND
13 +5V SUPPLY
+10V REF. 21
BIPOLAR 20
ANALOG INPUT 19
REF
S2
FLASH
S/H ADC
S1
BUFFER
–
+
DAC
17 ENABLE (1-12)
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 8
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)
COMP BIN 18
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
13
+5V SUPPLY
14
DIGITAL GROUND
22
+15V SUPPLY
23
ANALOG GROUND
Figure 1. ADS-117 Functional Block Diagram
24
–15V SUPPLY
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
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ADS-117
Table 3. Output Coding
UNIPOLAR
SCALE
STRAIGHT BIN.
COMP. BINARY
INPUT RANGE
OUTPUT CODING
0 to +10V MSB LSB
MSB
INPUT RANGE
LSB
±5V
+FS – 1 LSB
+7/8 FS
+3/4 FS
+1/2 FS
+1/4 FS
+1/8 FS
+1 LSB
0
+9.9976
+8.7500
+7.5000
+5.0000
+2.5000
+1.2500
+0.0024
0.0000
1111 1111 1111
1110 0000 0000
1100 0000 0000
1000 0000 0000
0100 0000 0000
0010 0000 0000
0000 0000 0001
0000 0000 0000
0000 0000 0000
0001 1111 1111
0011 1111 1111
0111 1111 1111
1011 1111 1111
1101 1111 1111
1111 1111 1110
1111 1111 1111
+4.9976
+3.7500
+2.5000
0.0000
–2.5000
–3.7500
–4.9976
–5.0000
BIPOLAR
SCALE
+FS –1 LSB
+3/4FS
+1/2FS
0
–1/2FS
–3/4FS
–FS+1LSB
–FS
OFF. BINARY
COMP. OFF. BIN.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Frequency (MHz)
(fs = 2MHz, fin = 980kHz, Vin = –0.5dB, 4,096-point FFT)
Figure 5. FFT Analysis of ADS-117
0.9
1.0
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ADS117.PDF ] | |
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