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ADS-926 데이터시트 PDF




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부품번호 ADS-926 기능
기능 Low-Power Sampling A/D Converters
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ADS-926 데이터시트, 핀배열, 회로
FEATURES
„ 14-bit resolution
„ 500kHz sampling rate
„ Functionally complete; No missing codes
„ Small 24-pin DDIP or SMT package
„ Operates from ±15V or ±12V supplies
+5V supply
„ Low power, 1.75 Watts maximum
„ Samples up to Nyquist frequencies
„ Outstanding dynamic performance
„ Bipolar ±5V input range (for unipolar 0 to 10V
input range see ADS-916)
„ For two’s complement output coding, please
order ADS-926-2 models
BLOCK DIAGRAM
ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
PRODUCT OVERVIEW
The ADS-926 is a high-performance, 14-bit,
500kHz sampling A/D converter. This device
accurately samples full-scale input signals up to
Nyquist frequencies with no missing codes and
exhibits outstanding dynamic performance that
surpasses most 16-bit, 500kHz sampling A/D's.
THD and SNR, for example, are typically –90dB
and 80dB when converting fullscale input signals
up to 100kHz.
Housed in a small 24-pin DDIP or SMT (gull-
wing) package, the functionally complete ADS-926
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. Digital input and output levels
are TTL. The ADS-926-2 series provide MSB at Pin
18 instead of MSB for two’s complement output
coding.
Requiring ±15V (or ±12V) and +5V supplies,
the ADS-926 dissipates only 1.75W (1.6W for
±12V), maximum. The unit is offered with a bipolar
input (–5V to +5V). Models are available for use
in either commercial (0 to +70°C), industrial (–40
to +100°C), or HI-REL (–55 to +125°C) operating
temperature ranges.
Applications include radar, sonar, spectrum
analysis, and graphic/medical imaging. Contact
DATEL for information on devices screened to
MIL-STD-883.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 14 (LSB)
24 –12V/–15V SUPPLY
2 BIT 13
23 ANALOG GROUND
3 BIT 12
22 +12V/+15V SUPPLY
4 BIT 11
21 +10V REFERENCE OUT
5 BIT 10
20 ANALOG INPUT
6 BIT 9
19 ANALOG GROUND
7 BIT 8
18 BIT 1 (MSB)*
8 BIT 7
17 BIT 2
9 BIT 6
16 START CONVERT
10 BIT 5
15 EOC
11 BIT 4
14 DIGITAL GROUND
12 BIT 3
13 +5V SUPPLY
*MSB for ADS-926-2 models
+10V REF. OUT 21
ANALOG INPUT 20
S/H
+
REF
S2
FLASH
ADC
S1 BUFFER
DAC
START CONVERT 16
EOC 15
TIMING AND
CONTROL LOGIC
18 BIT 1 (MSB)
17 BIT 2
12 BIT 3
11 BIT 4
10 BIT 5
9 BIT 6
8 BIT 7
7 BIT 8
6 BIT 9
5 BIT 10
4 BIT 11
3 BIT 12
2 BIT 13
1 BIT 14 (LSB)
13
+5V SUPPLY
14
DIGITAL GROUND
22
+12V/+15V SUPPLY
19, 23
ANALOG GROUND
Figure 1. ADS-926 Functional Block Diagram
24
–12V/–15V SUPPLY
DATEL, Inc. 11 Cabot Boulevard, Manseld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
02 Oct 2015 MDA_ADS-926.C03.D1 Page 1 of 9




ADS-926 pdf, 반도체, 판매, 대치품
ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
CALIBRATION PROCEDURE (Refer to Figures 2 and 3)
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 circuit of Figure 2
are guaranteed to compensate for the ADS-926's initial accuracy errors
and may not be able to compensate for additional system errors.
All fixed resistors in Figure 2 should be metal-film types, and multiturn
potentiometers should have TCR’s of 100ppm/°C or less to minimize drift
with temperature.
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.
For the ADS-926, offset adjusting 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 (+305μV).
+15V
ZERO/
OFFSET
ADJUST
20kΩ
–15V
GAIN
ADJUST
SIGNAL
INPUT
50Ω
1.2MΩ
1.98kΩ
2kΩ
+15V
To Pin 20
of ADS-926
15V
Figure 2. ADS-926 Calibration Circuit
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 1½ LSB's (+4.999085V).
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input (pin 16) so the con-
verter is continuously converting. If using LED's on the outputs, a 200kHz
conversion rate will reduce flicker.
2. Apply +305μV to the ANALOG INPUT (pin 20).
3. Adjust the offset potentiometer until the output bits are a 1 and all 0's and
the LSB flickers between 0 and 1.
Gain Adjust Procedure
1. 1. Apply +4.999085V to the ANALOG INPUT (pin 20).
2. Adjust the gain potentiometer until the output bits are all 1's and the LSB
flickers between 1 and 0.
Table 1. Zero and Gain Adjust
INPUT VOLTAGE ZERO ADJUST GAIN ADJUST
RANGE
+½ LSB
+FS –1½ LSB
±5V
+305μV
+4.999085V
Table 2. Output Coding
OUTPUT CODING
MSB LSB
INPUT RANGE
±5V
BIPOLAR SCALE
11 1111 1111 1111
11 1000 0000 0000
11 0000 0000 0000
10 0000 0000 0000
01 0000 0000 0000
00 1000 0000 0000
00 0000 0000 0001
00 0000 0000 0000
+4.99939
+3.75000
+2.50000
0.00000
–2.50000
–3.75000
–4.99939
–5.00000
+FS –1 LSB
+3/4 FS
+1/2FS
0
–1/2FS
–3/4FS
–FS +1 LSB
–FS
Coding is offset binary; 1LSB = 610μV.
+5V
–12V/–15V
+12V/+15V
+
4.7μF
0.1μF
4.7μF
+
4.7μF
+
0.1μF
0.1μF
–5V to +5V
0.1μF
+
4.7μF
13
14
DIGITAL
GROUND
ADS-926
24
19, 23
ANALOG
GROUND
22
20
ANALOG
INPUT
21 +10V REF. OUT
START
CONVERT
16
18 BIT 1 (MSB)
17 BIT 2
12 BIT 3
11 BIT 4
10 BIT 5
9 BIT 6
8 BIT 7
7 BIT 8
6 BIT 9
5 BIT 10
4 BIT 11
3 BIT 12
2 BIT 13
1 BIT 14 (LSB)
15 EOC
Figure 3. Typical ADS-926 Connection Diagram
DATEL, Inc. 11 Cabot Boulevard, Manseld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
02 Oct 2015 MDA_ADS-926.C03.D1 Page 4 of 9

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ADS-926 전자부품, 판매, 대치품
ADS-926
14-Bit, 500kHz, Low-Power Sampling A/D Converters
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
0
25 50 75 100 125 150 175 200 225
Frequency (kHz)
(fs = 500kHz, fin = 240kHz, Vin = –0.5dB, 16,384-point FFT)
Figure 6. ADS-926 FFT Analysis
250
+0.59
DNL (LSB's)
0
–0.57
0
Digital Output Code
16,384
0
Digital Output Code
16,384
Figure 7. ADS-926 Histogram and Differential Nonlinearity
DATEL, Inc. 11 Cabot Boulevard, Manseld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: [email protected]
02 Oct 2015 MDA_ADS-926.C03.D1 Page 7 of 9

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