ADC-228 [ETC]
8-Bit, 20MHz, Complete 8-Bit, 20MHz, Complete Flash A/D Converter; 8位， 20MHz的，完整的8位， 20MHz的，完整的Flash A / D转换器
| 型号： | ADC-228 |
| 厂家： | 
ETC |
| 描述： | 8-Bit, 20MHz, Complete 8-Bit, 20MHz, Complete Flash A/D Converter |
| 文件： | 总4页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
®
ADC-2 2 8
8-Bit, 20MHz, Complete
Flash A/D Converter
INN OVATION and E XCELLENCE
FEATURES
• 8-Bit flash A/D converter
• 20MHz sampling rate
• Complete support circuitry
• Low power, 1.5W
• 7MHz full power bandwidth
• Sample-hold not required
• Three-state outputs
• MIL-STD-883 versions
GENERAL DESCRIPTION
INPUT/OUTPUT CONNECTIONS
The ADC-228 combines analog front-end circuitry and a flash
A/D converter to digitize high-speed analog signals at a rate of
20 million samples per second. The ADC-228 contains an
8-bit, 20MHz, flash A/D, a wideband analog input buffer, a
precision voltage reference, temperature compensation
circuitry, reference trims, and a three-state output buffer in a
24-pin package.
PIN
FUNCTION
PIN
FUNCTION
1
2
3
+5V SUPPLY
GROUND
+5V REFERENCE OUT
GROUND
ANALOG INPUT
GROUND
GROUND
NLINV
24
23
22
21
20
19
18
17
16
15
14
13
BIT 8 (LSB)
BIT 7
BIT 6
4
BIT 5
The ADC-228 offers significant savings by combining all of the
circuitry in a single package. Valuable board real estate is
saved, and design time and manufacturing costs are reduced.
5
NO CONNECTION
+15V SUPPLY
CLOCK INPUT
BIT 4
6
7
The ADC-228 is housed in a 24-pin ceramic DDIP package
and is available in the commercial, 0 to +70°C, or military,
–55 to +125°C, temperature ranges. A MIL-STD-883 version
is also available. Operation is from ±15V and +5V power
supplies.
8
9
NMINV
BIT 3
10
11
12
–15V SUPPLY
CS1
BIT 2
BIT 1 (MSB)
NO CONNECTION
CS1
CS1 11
CS1 12
13 NO CONNECTION
20 NO CONNECTION
NLINV
NMINV
CLOCK 18
8
9
14 BIT 1 (MSB)
15 BIT 2
16 BIT 3
8-BIT
20MHz
FLASH
ANALOG INPUT
5
17 BIT 4
TRI-STATE
BUFFER
INPUT
BUFFER
21 BIT 5
LINEARIZATION
& TEMPERATURE
COMPENSATION
NETWORK
CONVERTER
22 BIT 6
+15V SUPPLY 19
–15V SUPPLY 10
23 BIT 7
24 BIT 8 (LSB)
GROUND
GROUND
GROUND
7
6
4
3
+5V REF. OUT
VOLTAGE
REFERENCE
NETWORK
GROUND
2
1
+5V SUPPLY
Figure 1. Functional Block Diagram
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
®
®
ADC-2 2 8
ABSOLUTE MAXIMUM RATINGS
DYNAMIC PERFORMANCE MIN.
TYP.
MAX.
UNITS
PARAMETER
LIMITS
Total Harm. Distortion, –0.5dB
DC to 2.5 MHz
2.5 MHz to 5 MHz
5 MHz to 10 MHz
Signal-to-Noise Ratio
and Distortion, –0.5dB
DC to 2.5 MHz
2.5 MHz to 5 MHz
5 MHz to 10 MHz
Signal-to-Noise Ratio
w/o Distortion, –0.5 dB
DC to 2.5 MHz
2.5 MHz to 5 MHz
5 MHz to 10 MHz
Effective Bits, –0.5dB
DC to 2.5 MHz
2.5 MHz to 5 MHz
5 MHz to 10 MHz
Input Bandwidth
Full Power
—
—
—
–55
–50
–39
–53
–48
–36
dB
dB
dB
Power Supply Voltage,
Pin 1
–0.3 to +18V
+0.3 to –18V
–0.5 to +7V
Pin 19
Pin 10
Digital Inputs, Pins 8,9,11,12,18 –0.5 to +5.5V
Analog Input, Pin 5
Digital Outputs
Lead Temp. (10 seconds)
–6 to +7.5V
–0.5 to +5.5V (short circuit protected to ground)
+300°C
44
43
35
49
46
38
—
—
—
dB
dB
dB
45
45
42
48
48
45
—
—
—
dB
dB
dB
FUNCTIONAL SPECIFICATIONS
(Apply over the operating temperature range with 20MHz clock and ±15V and +5V
power supply voltages, unless otherwise specified.)
7.1
6.9
5.6
7.75
7.4
6.1
—
—
—
Bits
Bits
Bits
ANALOG INPUTS
MIN.
TYP.
MAX.
UNITS
Single-Ended, Non-Isolated
Input Range, dc-20MHz
Input Resistance
0
2.45
—
—
2.5
5
+5.0
2.55
10
Volts
kΩ
pF
7
40
—
—
—
—
MHz
MHz
Small Signal (–20dB)
Input Capacitance
POWER SUPPLY
DIGITAL INPUTS
Power Supply Range
+15V Supply
–15V Supply
+5V Supply
Power Supply Current
+15V Supply
–15V Supply
+5V Supply
Power Dissipation
±12V, +5V Nominal
Over full supply range
±15V, +5V Nominal
Logic Levels
Logic 1
Logic 0
Logic Loading
Logic 1
Logic 0
Clock Pulse Widths
"High"
+11
–11
+4.75
+15
–15
+5
+15.75
–15.75
+5.25
Volts
Volts
Volts
+2.0
—
—
—
—
+0.8
Volts
Volts
—
—
—
—
+160
–0.5
µA
mA
—
—
—
—
—
—
+30
–10
+230
mA
mA
mA
25
19
—
—
—
—
ns
ns
"Low"
—
—
—
1.4
1.6
1.5
1.65
1.85
1.75
Watts
Watts
Watts
DIGITAL OUTPUTS
Straight bin., comp. bin., two's
Coding
PHYSICAL/ENVIRONMENTAL
comp.,
comp. two's comp.
8 bits
Resolution
Logic Levels
Logic 1
Logic 0
Logic Loading
Logic 1
Logic 0
Operating Temp. Range, Case
ADC-228MC
ADC-228MM, ADC-228/883
Storage Temp. Range
Package Type
0 to +70°C
–55 to +125°C
–65 to +150°C
+2.4
—
—
—
—
+0.4
Volts
Volts
24-pin, ceramic DDIP
0.3 ounces (8.5 grams)
—
—
—
—
–1
+1
mA
mA
Weight
Output Data Valid Delay
From Rising Edge
Output Hold Time
—
5
30
—
40
—
ns
ns
Footnotes:
➀ At full power input and chip selects enabled.
➁ See Technical Note 3.
PERFORMANCE
➂ For 10-step, 40 IRE NTSC ramp test.
Sampling Rate ➀
Differential Linearity ➁
Code Transitions
Code Centers
20
—
—
MHz
—
—
±0.5
±0.25
±0.75
±0.5
LSB
LSB
Integral Linearity, +25°C
End-point
Best-fit Line
Over Temperature End-point
Best-fit Line
—
—
—
—
±0.5
±0.35
—
±0.75
±0.5
±1
LSB
LSB
LSB
LSB
—
±1
Zero-Scale Offset
Code "0" to "1" Transition
+25°C
–55 to +125°C
Gain error
Full Scale Absolute Accuracy
Differential Gain ➂
Differential Phase ➂
Aperture Delay
—
—
—
—
—
—
—
—
—
±0.5
±0.5
±0.5
2
1
8
50
±0.5
±1.5
±1.5
±1.5
—
—
—
—
LSB
LSB
LSB
LSB
%
deg.
ns
ps
Aperture Jitter
No Missing Codes
Power Supply Rejection
Over the operating temperature range
±0.02% FSR/%V maximum
S
2
®
®
ADC-2 2 8
TECHNICAL NOTES
3. DATEL uses conservative definitions when specifying
1. Rated performance requires using good high-frequency
techniques. The analog and digital ground pins are
integral linearity (end-point) and differential linearity (code
transition). The specifications using the less conservative
definitions have also been provided as a comparative
specification for products specified this way.
connected to each other internally. Avoid ground related
problems by connecting the grounds to one point, the
ground plane beneath the converter. Due to the inductance
and resistance of the power supply return paths, return the
analog and digital ground separately to the power supplies.
4. Single conversions (one-shot mode) would require another
clock edge to read out data. Users desiring to provide just
a single clock pulse could use the circuit shown in Figure 2
to obtain the data.
2. Bypass all the analog and digital supplies and the +5V
REFERENCE (pin 3) to ground with a 4.7µF, 25V tantalum
electrolytic capacitor in parallel with a 0.1µF ceramic
capacitor.
–15V
+5V
0.1µF
0.1µF
74HC86
4.7µF
+
+
4.7µF
1
10
CLOCK
IN
W
250
14
NLINV 8
NMINV 9
CLOCK
OUT
B1 (MSB)
B2
15
16
17
21
22
23
24
100pF
B3
B4
50ns
CS1 11
CS1 12
B5
ADC-228
B6
B7
CLOCK 18
B8 (LSB)
25ns
ANALOG
INPUT
PULSES
13, 20
3
NO CONNECTION
VIN
5
DATA N
SAMPLED
+5V REFERENCE OUT
DATA N
VALID
19
2, 4, 6, 7
W
W
51
9k
0.1µF
+
*Optional
0.1µF
4.7µF
40ns
+
* Use optional resistor only if
amp is not used to drive input.
R = VEE /1.667mA
4.7µF
Figure 2. ADC-228 Single Clock Pulse
Circuit and Operation
+15V
Figure 3. ADC-228 Typical Connections
Table 2. ADC-228 Bipolar Output Coding
(Assumes analog input is externally offset)
Table 1. ADC-228 Unipolar Output Coding
TWO’S
COMP.
NMINV = 1
NLINV = 0
COMP.
TWO’S COMP.
NMINV = 0
STRAIGHT BIN.
NMINV = 0
COMP. BIN.
NMINV = 1
NLINV = 1
ANALOG
INPUT
ANALOG
INPUT
CODE
NLINV = 0
CODE
NLINV = 1
+4.96V
+3.75V
+2.50V
+1.25V
+0.02V
0.00V
+FS – 1 LSB
+ 3/4 FS
+ 1/2 FS
+ 1/4 FS
+ 1 LSB
ZERO
1111 1110
1100 0000
1000 0000
0100 0000
0000 0001
0000 0000
0000 0001
0011 1111
0111 1111
1011 1111
1111 1110
1111 1111
+2.480V
+1.250V
+0.020V
+0.000V
–1.250V
–2.480V
–2.500V
+FS – 1 LSB
+1/2 FS
+1 LSB
0111 1111
0100 0000
0000 0001
0000 0000
1100 0000
1000 0001
1000 0000
1000 0000
1011 1111
1111 1110
1111 1111
0011 1111
0111 1110
0111 1111
ZERO
–1/2 FS
–FS + 1 LSB
–FS
3
®
®
ADC-2 2 8
Table 3. Chip Select Truth Table
SAMPLE
N + 1
SAMPLE
N + 2
SAMPLE
N
CS1
CS1
CLOCK
Pin 12
Pin 11
Bits 1-8
OUTPUT
DELAY
0
0
1
1
0
1
0
1
Three State Mode
Three State Mode
Data Outputted
DATA
N – 1
DATA
N + 1
DATA
N
DIGITAL
OUTPUT
OUTPUT
HOLD TIME
Three State Mode
Figure 4. ADC-228 Timing Diagram
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
24
1
13
12
Lead Material: Kovar alloy
0.80 MAX.
(20.32)
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
0.200 MAX.
(5.080)
+0.002
–0.001
0.010
(0.254)
0.190 MAX.
(4.826)
0.100
(2.540)
0.100
(2.540)
0.600 ±0.010
(15.240)
SEATING
PLANE
0.025
0.040
(1.016)
0.018 ±0.002
(0.457)
(0.635)
ORDERING INFORMATION
MODEL
TEMPERATURE RANGE
ADC-228MC
ADC-228MM
ADC-228/883
0 to +70°C
–55 to +125°C
–55 to +125°C
Receptacle for PC board mounting can be ordered through AMP Inc., part # 3-331272-8
(component lead socket), 24 required. Contact DATEL for 883 product specifications
®
®
ISO 9001
R
E
G
I
S
T
E
R
E
D
INN OVAT ION and E XCELLENCE
DS-0211B 10/96
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail:sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
相关型号：
©2020 ICPDF网 联系我们和版权申明