ADS-230 Datasheet, PDF (1/12 Pages) Murata Power Solutions Inc. – Low-Power, 12-Bit, 1.0/1.5MHz Sampling A/D Converter

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FEATURES
• 12-bit resolution
• 1.0 and 1.5MHz throughput rates
• Small 44-pin Leaded Chip Carrier
• Single +5V supply
• Low power, 75 and 200mW maximum
• Low power "standby" mode
• Outstanding dynamic performance
• No missing codes over temperature
• Built-in sample-and-hold
• Optional two-channel input multiplexer
• Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The ADS-230 and ADS-231 are 12-bit, high speed CMOS
sampling analog-to-digital converters capable of minimum
sampling rates of 1.0 and 1.5MHz, respectively. Both models
feature excellent dynamic performance including a typical
SNR of 72dB for the ADS-230 and 70dB for the ADS-231.
The ADS-230 and ADS-231 are packaged in a small 44-pin
plastic Leaded Chip Carrier (LCC). Each model contains a
fast-settling sample/hold amplifier, a multipass (three-step
flash) A/D converter, timing and control logic, three-state
outputs, a two-channel multiplexer, and digital error correction
circuitry. Digital input and output levels are TTL.
Requiring only a single +5V supply, the ADS-230 typically
dissipates only 60mW and the ADS-231 only 170mW. Both
models offer a low-power "standby" mode resulting in typical
power dissipations of 100µW and 250µW, respectively. The
units offer a maximum unipolar input range of 0 to +5V. The
exact value of the input range is determined by an externally
applied reference voltage. Both models operate over the
extended –40 to +85°C temperature range.
ADS-230/ADS-231
Low-Power, 12-Bit, 1.0/1.5MHz
Sampling A/D Converter
INPUT/OUTPUT CONNECTIONS
PIN
FUNCTION
1
AGND
2
VBS
3
VB
4
VR/16
5
VT
6
VTS
7
CH1IN
8
NC
9
CH2IN
10 NC
11 MUX OUT
12 ANALOG INPUT
13 AGND
14
AVS
15 DGND C
16 SEL
17 PD
18 DGND C
19 MD
20 OE
21 RD
22 S/H
PIN
FUNCTION
44
AVS
43 BIT 1 (MSB)
42 BIT 2
41 BIT 3
40 BIT 4
39 BIT 5
38 BIT 6
37 BIT 7
36 BIT 8
35 BIT 9
34 NC
33 BIT 10
32 BIT 11
31 BIT 12 (LSB)
30 EOC
29 INT
28 NC
27 DGND D
26 DGND C
25
DVS
24 TEST
23 CS
AVS DVS
14,44 25
ANALOG INPUT 12
SAMPLE
AND HOLD
MUX OUT 11
CH1IN 7
CH2IN 9
MULTIPLEXER
VTS VT VR/16 VB VBS
65 432
12-BIT A/D CONVERTER
OUTPUT LATCH
AND
THREE-STATE
BUFFER
TIMING AND CONTROL CIRCUITRY
PIN
43 BIT 1 (MSB)
42 BIT 2
41 BIT 3
40 BIT 4
39 BIT 5
38 BIT 6
37 BIT 7
36 BIT 8
35 BIT 9
33 BIT 10
32 BIT 11
31 BIT 12 (LSB)
29 INT
30 EOC
16 26,18,15
SEL DGND C
27
DGND D
1,13 24 23 22 21 20
AGND TEST CS S/H RD OE
19 17
MD PD
Figure 1. ADS-220/-231 Simplified Block Diagram
DATEL, Inc., Mansfield, MA 02048 (U.S.A.) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com