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ADC-207LM Arkusz danych(PDF) 2 Page - Murata Power Solutions Inc.

Numer części ADC-207LM
Szczegółowy opis  7-Bit, 20MHz, CMOS Flash A/D Converters
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Producent  MURATA-PS [Murata Power Solutions Inc.]
Strona internetowa  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

ADC-207LM Arkusz danych(HTML) 2 Page - Murata Power Solutions Inc.

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PHYSICAL/ENVIRONMENTAL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
Operating Temp. Range, Case:
LC/MC Versions
0
+70
°C
MM/LM/QL Versions
–55
+125
°C
Storage Temp. Range
–65
+150
°C
Package Type
DIP
18-pin ceramic DIP
LCC
24-pin ceramic LCC
Functional Specifications
(Typical at +5V power, +25°C, 20MHz clock, +REFERENCE = +5V,
–REFERENCE = ground, unless noted)
ANALOG INPUT
MIN.
TYP.
MAX.
UNITS
Input Type
Single-ended, non-isolated
Input Range (dc-20MHz)
0
+5
Volts
Input Impedance
1000
Ohms
Input Capacitance (Full Range)
10
pF
DIGITAL INPUTS
Logic Levels
Logic "1"
+3.2
Volts
Logic "0"
+0.8
Volts
Logic Loading "1"
±1
±5
microamps
Logic Loading "0"
±1
±5
microamps
Sample Pulse Width
(During Sampling Portion of Clock)
12
ns
Reference Ladder Resistance
225
330
Ohms
PERFORMANCE
Conversion Rate
20
25
MHz
Harmonic Distortion
(8MHz 2nd Order Harmonic)
–40
dB
Differential Gain
3
%
Differential Phase
1.5
degrees
Aperture Delay
8
ns
Aperture Jitter
50
ps
No Missing Codes
LC/MC grade
0
+70
°C
LM/MM grade
–55
+125
°C
Integral Linearity
±0.8
±1
LSB
Over Temperature Range
±1
LSB
Differential Nonlinearity
±0.3
±0.5
LSB
Over Temperature Range
±0.4
±0.6
LSB
Power Supply Rejection
±0.02
%FSR/%Vs
DIGITAL OUTPUTS
Data Coding
Straight binary
Data Output Resolution
7
Bits
Logic Levels
Logic "1"
+2.4
+4.5
Volts
Logic "0" (at 1.6mA)
+0.4
Volts
Logic Loading "1"
–4
mA
Logic Loading "0"
+4
mA
Output Data Valid Delay
(From Rising Edge)
15
17
ns
POWER REQUIREMENTS
Power Supply Range (+VDD)
+3.0
+5.0
+5.5
Volts
Power Supply Current
+50
+70
mA
Power Dissipation
250
385
mW
Footnotes:
➀ At full power input and chip selects enabled.
➁ At 4MHz input and 20MHz clock.
➂ For 10-step, 40 IRE NTSC ramp test.
➃ Adjustable using reference ladder midpoint tap. See ADC-207 Operation.
(MSB)
0.1µF
0.1µF
4.7µF
0.01µF
+5V
+15
+
+
–15
47µF
11
12
10
5
HA-5033
10
W
+5V
20MHz
CLOCK
(LSB)
B7
B6
B5
B4
B3
B2
B1
OF
OF
B1
B2
B3
B4
B5
B6
B7
+VDD
CS2
CS1
+REFERENCE
MID
VIN
–REFERENCE
DIGITAL GND
ANALOG GND
CLOCK
18
1
2
3
4
5
6
7
8
9
0.1µF
+
47µF
17
16
15
14
13
12
11
10
PARAMETERS
LIMITS
UNITS
Power Supply Voltage (+VDD)
–0.5 to +7
Volts
Digital Inputs
–0.5 to +5.5
Volts
Analog Input
–0.5 to (+VDD +0.5)
Volts
Reference Inputs
–0.5 to +VDD
Volts
Digital Outputs
–0.5 to +5.5
Volts
(short circuit protected to ground)
Lead Temperature (10 sec. max.)
+300
°C
ABSOLUTE MAXIMUM RATINGS
Figure 2. Typical Connections for Using the ADC-207
TECHNICAL NOTES
1. Input Buffer Amplifier – Since the ADC-207 has a switched capacitor type input, the input
impedance of the 207 is dependent on the clock frequency. At relatively slow conversion rates,
a general purpose type input buffer can be used; at high conversion rates DATEL recommends
either the HA-5033 or Elantec 2003. See Figure 2 for typical connections.
2. Reference Ladder – Adjusting the voltage at +REFERENCE adjusts the gain of the ADC-207.
Adjusting the voltage at –REFERENCE adjusts the offset or zero of the ADC-207. The midpoint
pin is usually bypassed to ground through a 0.1µF capacitor, although it can be tied to a precision
voltage halfway between +REFERENCE and –REFERENCE. This would improve integral linearity
beyond 7 bits.
3. Clock Pulse Width – To improve performance at Nyquist bandwidths, the clock duty cycle can
be adjusted so that the low portion of the clock pulse is 12ns wide. The smaller aperture allows
the ADC-207 to closely resemble an ideal sampler. See Figure 4.
4. At sampling rates less than 100kHz, there may be some degradation in offset and differential
nonlinearity. Performance may be improved by increasing the clock duty cycle (decreasing the
time spent in the sample mode).
CAUTION
Since the ADC-207 is a CMOS device, normal precautions against static electricity should be
taken. Use ground straps, grounded mats, etc. The Absolute Maximum Ratings of the device
MUST NOT BE EXCEEDED as irrevocable damage to the ADC-207 will occur.


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