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ML2281CCP Folha de dados(PDF) 6 Page - Micro Linear Corporation

Nome de Peças ML2281CCP
Descrição Electrónicos  Serial I/O 8-Bit A/D Converters with Multiplexer Options
Download  26 Pages
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Fabricante Electrônico  MICRO-LINEAR [Micro Linear Corporation]
Página de início  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML2281CCP Folha de dados(HTML) 6 Page - Micro Linear Corporation

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ML2281, ML2282, ML2284, ML2288
6
ELECTRICAL CHARACTERISTICS (Continued)
TYP
LIMIT
SYMBOL
PARAMETER
CONDITIONS
MIN
NOTE 3
MAX
UNITS
AC ELECTRICAL CHARACTERISTICS
fCLK
Clock Frequency
(Note 4)
10
1.333
kHz
tACQ
Sample-and-Hold Acquisition
1/2
1/fCLK
tC
Conversion Time
Not including MUX adddressing time
8
1/fCLK
SNR
Signal to Noise Ratio
VIN = 40kHz, 5V sine. fCLK = 1.333MHz
47
dB
ML2281
(fSAMPLING » 120kHz). Noise is sum of all
nonfundamental components up to 1/2
of fSAMPLING (Note 11)
THD
Total Harmonic Distortion
VIN = 40kHz, 5V sine. fCLK = 1.333MHz
–60
dB
ML2281
(fSAMPLING » 120kHz). THD is sum of 2,
3, 4, 5 harmonics relative to fundamental
(Note 11)
IMD
Intermodulation Distortion
VIN = fA + fB. fA = 40kHz, 2.5V sine.
–60
dB
ML2281
fB = 39.8kHz, 2.5V Sine, fCLK = 1.333MHz
(fSAMPLING » 120kHz). IMD is (fA + fB),
(fA – fB), (2fA + fB), (2fA – fB), (fA + 2fB),
(fA – 2fB) relative to fundamental (Note 11)
Clock Duty Cycle
(Notes 4, 10)
40
60
%
tSET-UP
CS Falling Edge or Data Input (Note 4)
130
ns
Valid to CLK Rising Edge
tHOLD
Data Input Valid after
(Note 4)
80
ns
CLK Rising Edge
tPD1,
CLK Falling Edge to Output
CL = 100pF (Note 4 & 12)
tPD0
Data Valid
Data MSB first
90
200
ns
Data LSB first
50
110
ns
t1H,
Rising Edge of CS to Data
CL = 10pF, RL = 10k (see high impedance
40
90
ns
t0H
Output and SARS Hi-Z
test circuits) (Note 5)
CL = 100pF, RL = 2k (Note 4)
80
160
ns
CIN
Capacitance of Logic Input
5
pF
COUT
Capacitance of Logic Outputs
5
pF
Note 1:
When the input voltage (VIN) at any pin exceeds the power supply rails (VIN < GND or VIN > VCC) the absolute value of current at that pin should be limited to 25mA
or less.
Note 2:
0°C to 70°C and –40°C to +85°C operating temperature range devices are 100% tested with temperature limits guaranteed by 100% testing, sampling, or by
correlation with worst-case test conditions.
Note 3:
Typicals are parametric norm at 25°C.
Note 4:
Parameter guaranteed and 100% production tested.
Note 5:
Parameter guaranteed. Parameters not 100% tested are not in outgoing quality level calculation.
Note 6:
Total unadjusted error includes offset, full-scale, linearity, multiplexer and sample-and-hold errors.
Note 7:
Cannot be tested for ML2282.
Note 8:
For VIN– ³ VIN+ the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward conduct for
analog input voltages one diode drop below ground or one diode drop greater than the VCC supply. Be careful, during testing at low VCC levels (4.5V), as high level
analog inputs (5V) can cause this input diode to conduct—especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows
50mV forward bias of either diode. This means that as long as the analog VIN or VREF does not exceed the supply voltage by more than 50mV, the output code will be
correct. To achieve an absolute 0V to 5V input voltage range will therefore require a minimum supply voltage of 4.950VDC over temperature variations, initial
tolerance and loading.
Note 9:
Leakage current is measured with the clock not switching.
Note 10: A 40% to 60% clock duty cycle range insures proper operation at all clock frequencies. In the case that an available clock has a duty cycle outside of these limits, the
minimum time the clock is high or the minimum time the clock is low must be at least 300ns. The maximum time the clock can be high or low is 60µs.
Note 11: Because of multiplexer addressing, test conditions for the ML2282 would be VIN = 34kHz, 5V sine (fSAMPLING » 102kHz); ML2284 VIN = 32kHz, 5V sine
(fSAMPLING » 95kHz); ML2288 VIN = 30kHz, 5V sine (fSAMPLING » 89kHz).
Note 12: Since data, MSB first, is the output of the comparator used in the successive approximation loop, an additional delay is built in (see Block Diagram) to allow for
comparator response time.


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