ADS 949
14 Bit, 12.8MHz
Sampling A/D Converters
FEATURES
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14-bit resolution
12.8MHz minimum sampling rate
No missing codes over full military temperature range
Ideal for both time and frequency-domain applications
Excellent THD (–81dB) and SNR (78dB)
Edge-triggered
Small, 32-pin, side-brazed, ceramic TDIP or SMT
Low-power, 2 Watts
Low cost
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
INPUT/OUTPUT CONNECTIONS
FUNCTION
ViN A
ViN B
–5V
oFFSET ADj.
RANgE REF.
2.5V REF.
START CoNVERT
EoC
ENABLE
BiT 14 (LSB)
BiT 13
BiT 12
BiT 11
BiT 10
BiT 9
BiT 8
PIN
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
FUNCTION
RANgE
gAiN ADjUST
+5V ANALog
ANALog gND
+15V
+5V DigiTAL
DigiTAL gND
oVERFLoW
MSB
BiT 1 (MSB)
BiT 2
BiT 3
BiT 4
BiT 5
BiT 6
BiT 7
GENERAL DESCRIPTION
The low-cost ADS-949 is a 14-bit, 12.8MHz sampling A/D
converter. This device accurately samples full-scale input
signals up to Nyquist frequencies with no missing codes.
Excellent differential nonlinearity error (DNL), signal-to-noise
ratio (SNR), and total harmonic distortion (THD) make the
ADS-949 the ideal choice for both time-domain (CCD/FPA
imaging, scanners, process control) and frequency-domain
(radar, telecommunications, spectrum analysis) applications.
The functionally complete ADS-949 contains a fast-settling
sample/hold amplifier, a subranging A/D converter, an internal
reference, timing/control logic, and error-correction circuitry.
Digital input and output levels are TTL. The ADS-949 only
requires the rising edge of a start convert pulse to operate.
Requiring only +15V, +5V and –5V supplies, the ADS-949
typically dissipates just 2 Watts. The device is offered with a
Bipolar input range of ±2.5V and Unipolar range of 0 to 5 volts.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.
A proprietary, auto-calibrating, error-correcting circuit allows
the device to achieve specified performance over the full
military temperature range.
OFFSET ADJUST 4
BUFFER
VIN A
VIN B
1
2
–
+
S/H
10 BIT 14 (LSB)
FLASH
ADC
1
REGISTER
2.5 V REF 6
11 BIT 13
12 BIT 12
DIGITAL CORRECTION LOGIC
13 BIT 11
OUTPUT REGISTER
14 BIT 10
15 BIT 9
16 BIT 8
17 BIT 7
18 BIT 6
19 BIT 5
20 BIT 4
21 BIT 3
22 BIT 2
23 BIT 1 (MSB)
24 MSB
TIMING AND
CONTROL LOGIC
9
ENABLE
POWER AND GROUNDING
GAIN ADJUST
+5V ANALOG SUPPLY
+5V DIGITAL SUPPLY
V RANGE
–5.2V SUPPLY
+15V SUPPLY
ANALOG GROUND
DIGITAL GROUND
31
30
27
32
3
28
29
26
AMP
FLASH
ADC
2
REGISTER
REF
�½
DAC
START CONVERT 7
EOC 8
25 OVERFLOW
Figure 1. ADS-949 Functional Block Diagram
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_ADS-949.B01 Page 1 of 8
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
