adc-305 C&D Technologies., adc-305 Datasheet

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adc-305

Manufacturer Part Number
adc-305
Description
8-bit, 20mhz Cmos A/d Converters
Manufacturer
C&D Technologies.
Datasheet
DATEL, Inc., Mansfield, MA 02048-1151 (USA)
FEATURES
GENERAL DESCRIPTION
DATEL's ADC-305 is an 8-bit, 20MHz sampling, CMOS,
subranging (two-pass) A/D converter. It processes signals at
speeds comparable to a full flash converter by using a sub-
ranging conversion technique with multiple comparator blocks,
each containing a sample and hold amplifier.
The ADC-305 features CMOS low power dissipation (60mW
typical) and a wide 18MHz (–1dB) input signal bandwidth.
The ADC-305-1 is packaged in 400 mil 24-pin DIP and the
ADC-305-3 in 300 mil 24-pin SOP.
Other features are CMOS compatible input logic, 3-state TTL
compatible output logic, +5V single power operation, self bias
mode and low cost.
8-bit resolution, 20MHz min. sampling rate
±½LSB max. differential nonlinearity error
18MHz input signal bandwidth
Subranging, S&H enclosed
+5V single power, low 85mW max. dissipation
CMOS compatible logic input
3-State TTL compatible output
®
OUTPUT ENABLE 1
BIT 1 (MSB) 10
BIT 8 (LSB) 3
A/D CLK 12
OBSOLETE PRODUCT
+DV
DGND 2
Contact Factory for Replacement Model
BIT 7 4
BIT 6 5
BIT 5 6
BIT 4 7
BIT 3 8
BIT 2 9
S
11
LATCHES
LATCHES
LOWER
UPPER
DATA
DATA
GENERATOR
®
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
CLOCK
Figure 1. Functional Block Diagram
ENCODER
ENCODER
ENCODER
LOWER
LOWER
UPPER
(4 BIT)
(4 BIT)
(4 BIT)
Both the ADC-305-1 and the ADC-305-3 have the same pin assignment.
PIN
10
11
12
1
2
3
4
5
6
7
8
9
COMPARATORS
WITH S/H (4 BIT)
COMPARATORS
WITH S/H (4 BIT)
COMPARATORS
WITH S/H (4 BIT)
FUNCTION
OUTPUT ENABLE (OE)
DGND
BIT 8 (LSB)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
+DV
CLOCK INPUT (A/D CLK)
B BLOCK
A BLOCK
UPPER
S
(+5V)
INPUT/OUTPUT CONNECTIONS
CMOS A/D Converters
Email: sales@datel.com
REFERENCE
VOLTAGE
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
DGND
REF. BOTTOM (V
SELF BIAS 1 (V
AGND
AGND
ANALOG INPUT (V
+AV
REFERENCE TOP (V
SELF BIAS 2 (V
+AV
+AV
+DV
8-Bit, 20MHz
ADC-305
S
S
S
S
Internet www.datel.com
(+5V)
(+5V)
(+5V)
(+5V)
19 V
18 +AV
17 V
16 V
15 +AV
14 +AV
13 +DV
24 DGND
23 V
22 V
21 AGND
20 AGND
IN
RT
RTS
RB
RBS
RBS
RTS
RB
S
S
S
S
IN
)
)
)
)
R
T
)

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adc-305 Summary of contents

Page 1

... BIT 5 7 BIT 4 8 BIT 3 9 BIT 2 10 BIT 1 (MSB) 11 +DV 12 CLOCK INPUT (A/D CLK) Both the ADC-305-1 and the ADC-305-3 have the same pin assignment. LOWER B BLOCK ENCODER COMPARATORS (4 BIT) WITH S/H (4 BIT) LOWER A BLOCK ENCODER COMPARATORS (4 BIT) WITH S/H (4 BIT) UPPER UPPER ...

Page 2

... A 75 ohm — 5 µA resister inserted between the output of an amplifier and the — 5 µA analog input of the ADC-305 will improve the situation. A — — ns — — ns resistor larger than 100 ohms may degrade linearity. ...

Page 3

... OE - Low data is output when high digital output pins turn to high impedance RBS AGND 22 Generates +0.6V when shorted with Figure 3. Equivalent Circuits 3 ADC-305 will improve linearity of the system for higher PW1 N+4 N+3 N AGND Analog Input + RTS 16 Generates +2 ...

Page 4

... ADC-305 ADC-305 ANALOG INPUT ( A/D CLK UPPER SAMPLING COMPARATOR BLOCK UPPER OUTPUT DATA LOWER REFERENCE VOLTAGE LOWER SAMPLING S(1) COMPARATOR A BLOCK LOWER DATA A LOWER SAMPLING H(0-1) COMPARATOR B BLOCK LOWER LD(N-3) OUTPUT DATA B OUTPUT DATA N+1 N S(N) C(N) S(N+1) C(N+1) S(N+2) MD(N-1) MD(N) RV(N-1) RV(N) H(1) C(1) S(3) LD(N-2) C(N-1) S(N+1) H(N+1) LD(N-1) N-3 N-2 Figure 4. Timing Chart 4 ® ® N+3 N+2 C(N+2) S(N+3) C(N+3) MD(N+1) MD(N+2) RV(N+1) RV(N+2) H(3) C(3) LD(N) C(N+1) S(N+3) H(N+3) LD(N+1) N-1 N ® ® ...

Page 5

... Figure 5. Typical Connection Diagram Differential Linearity Error vs. Input Signal Frequency LSB +DVS=+AVS=+ 20.48MHz 0.6 Ta=25°C 0.4 0.2 4.0 4.5 5.0 5. Supply Voltage Input Signal Frequency Figure 6. Typical Performance Curves 5 ADC-305 +5V(D) 47µF 0.1µF 0.1µ BIT 1 (MSB BIT BIT BIT 4 74LS574 ...

Page 6

... DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 ® ADC-305-1 24-Pin DIP (Plastic) 400mil 2.0g 0.400 (10.16) 0.011 ±0.003 (0.28 ±0.08) ADC-305-3 24-Pin SOP (Plastic) 300mil 0 ...

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