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부품번호 | ADS-119 기능 |
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기능 | Low-Power Sampling A/D Converters | ||
제조업체 | DATEL | ||
로고 | |||
전체 8 페이지수
®®
ADS-119
12-Bit, 10MHz, Low-Power
Sampling A/D Converters
FEATURES
• 12-bit resolution
• 10MHz minimum sampling rate
• Functionally complete
• Small 24-pin DDIP or SMT package
• Requires only ±5V supplies
• Low-power, 1.8 Watts
• Outstanding dynamic performance
• Edge-triggered
• No missing codes over temperature
• Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The ADS-119 is a high-performance, 12-bit, 10MHz sampling
A/D converter. The device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-119 features
excellent dynamic performance including a typical SNR of
69dB.
Packaged in a metal-sealed, ceramic, 24-pin DDIP, the
functionally complete ADS-119 contains a fast-settling sample/
hold amplifier, a subranging (two-pass) A/D converter, a
precise voltage reference, timing/control logic, and error-
correction circuitry. All timing and control logic operates from
the rising edge of a single start convert pulse. Digital input and
output levels are TTL.
Requiring only ±5V supplies, the ADS-119 typically dissipates
1.8 Watts. The unit offers a bipolar input range of ±1.5V.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.
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
24 NO CONNECT
23 ANALOG GROUND
22 NO CONNECT
21 +5V ANALOG SUPPLY
20 –5V SUPPLY
19 ANALOG INPUT
18 ANALOG GROUND
17 OFFSET ADJUST
16 START CONVERT
15 DATA VALID
14 DIGITAL GROUND
13 +5V DIGITAL SUPPLY
Typical applications include signal analysis, medical/graphic
imaging, process control, ATE, radar, and sonar.
OFFSET ADJUST 17
ANALOG INPUT 19
–
S/H
+
BUFFER
FLASH
ADC
1
REF
Σ
DAC
AMP
FLASH
ADC
2
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 9
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)
START CONVERT 16
DATA VALID 15
TIMING AND
CONTROL LOGIC
21
+5V ANALOG
SUPPLY
13
+5V DIGITAL
SUPPLY
14
DIGITAL
GROUND
20
–5V SUPPLY
18, 23
ANALOG
GROUND
Figure 1. ADS-119 Functional Block Diagram
22, 24
NO CONNECT
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
ADS-119
®®
CALIBRATION PROCEDURE
(Refer to Figures 3 and 4, Table 1)
Any offset and/or gain calibration procedures should not be
implemented until devices are fully warmed up. To avoid
interaction, offset must be adjusted before gain. The ranges of
adjustment for the circuits in Figure 3 and 4 are guaranteed to
compensate for the ADS-119's initial accuracy errors and may
not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This can be accomplished by connecting LED's
to the digital outputs and adjusting until certain LED's "flicker"
equally between on and off. Other approaches employ digital
comparators or microcontrollers to detect when the outputs
change from one code to the next.
Offset adjusting for the ADS-119 is normally accomplished at
the point where the MSB is a 1 and all other output bits are 0's
and the LSB just changes from a 0 to a 1. This digital output
transition ideally occurs when the applied analog input is
+½ LSB (+366µV).
Gain adjusting is accomplished when all bits are 1's and the
LSB just changes from a 1 to a 0. This transition ideally occurs
when the analog input is at +full scale minus 1 ½ LSB's
(+1.4989V).
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
(pin 16) so the converter is continuously converting.
2. Apply +366µV to the ANALOG INPUT (pin 19).
3. Adjust the offset potentiometer until the output bits are
1000 0000 0000 and the LSB flickers between 0 and 1.
Gain Adjust Procedure
1. Apply +1.4989V to the ANALOG INPUT (pin 19).
2. Adjust the gain potentiometer until all output bits are 1's and
the LSB flickers between 1 and 0.
3. To confirm proper operation of the device, vary the input
signal to obtain the output coding listed in Table 1.
Table 1. Output Coding for Bipolar Operation
BIPOLAR
SCALE
ADS-119
INPUT VOLTAGE
(±1.5V RANGE)
OUTPUT CODING
OFFSET BINARY
MSB
LSB
+FS–1 LSB
+3/4 FS
+1/2 FS
0
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS
+1.49927V
+1.12500V
+0.75000V
0.00000V
–0.75000V
–1.12500V
–1.49927V
–1.50000V
1111 1111 1111
1110 0000 0000
1100 0000 0000
1000 0000 0000
0100 0000 0000
0010 0000 0000
0000 0000 0001
0000 0000 0000
GAIN
ADJUST
SIGNAL
INPUT
50Ω
1.98kΩ
2kΩ
+15V
To Pin 19
of ADS-119
–15V
Figure 3. Optional Calibration Circuit, ADS-119
+5V
4.7µF
0.1µF
13, 20
14
–5V
4.7µF
0.1µF
+5V
20
18, 20
OFFSET
ADJUST
17
20kΩ
–5V
ADS-119
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)
15 DATA VALID
19 ANALOG INPUT
16 START CONVERT
A single +5V supply should be used for both the +5V analog and +5V digital.
If separate supplies are used, the difference between the two cannot exceed 100mV.
Figure 4. Typical Connection Diagram
4
4페이지 ®®
+0.73
0
–0.47
0
Digital Output Code
4096
ADS-119
0
Digital Output Code
4096
Figure 8. ADS-119 Histogram and Differential Nonlinearity
PH vs. Input Frequency
80
THD vs. Input Frequency
80
70 70
60 60
50 50
40 40
30 30
20 20
10 10
00
1
10
100
1000
10000
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
SNR vs. Input Frequency
80
SNR+D vs. Input Frequency
80
70 70
60 60
50 50
40 40
30 30
20 20
10 10
00
1
10
100
1000
10000
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
Figure 9. ADS-119 Performance Curves
7
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부품번호 | 상세설명 및 기능 | 제조사 |
ADS-117 | Low-Power Sampling A/D Converters | Datel |
ADS-119 | Low-Power Sampling A/D Converters | DATEL |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |