X9530 Datasheet, PDF (25/30 Pages) Xicor Inc. – Temperature Compensated Laser Diode Controller

X9530
A/D CONVERTER CHARACTERISTICS
All typical values are for 25°C ambient temperature and 5 V at pin Vcc. Maximum and minimum specifications are over the
recommended operating conditions. All voltages are referred to the voltage at pin Vss unless otherwise specified. All bits in
control registers are “0” unless otherwise specified. 510¾, 0.1%, resistor connected between R1 and Vss, and another between
R2 and Vss unless otherwise specified. 400kHz TTL input at SCL unless otherwise specified. SDA pulled to Vcc through an external
2K¾ resistor unless otherwise specified. 2-wire interface in “standby” (see notes 1 and 2 on page 22), unless otherwise specified. WP,
A0, A1, and A2 floating unless otherwise specified.
Symbol
ADCTIME
RIN_ADC
CIN_ADC
VIN_ADC
Offset_ADC
FSError_ADC
DNL_ADC
INL_ADC
TempStep_ADC
Out25_ADC
Parameter
A/D converter conversion
time
VSense pin input
resistance
VSense pin input
capacitance
VSense input signal range
A/D converter offset error
A/D converter full scale
error
A/D Converter Differential
Nonlinearity
A/D converter Integral
Nonlinearity
Temperature step causing
one step increment of
ADC output
ADC output at 25°C
Min Typ Max Unit
9
ms
100
kΩ
1
7
pF
0
-0.25
-1
-0.5
-0.5
2.1
V(VRef) V
0.25 LSB
1
LSB
0.5 LSB
0.5 LSB
2.2
2.3
°C
011101₂
Test Conditions / Notes
Proportional to A/D converter
input voltage. This value is
maximum at full scale input
of A/D converter.
ADCfiltOff = “1”
VSense as an input,
ADCIN bit = “1”
VSense as an input,
ADCIN bit = “1”,
Frequency = 1 MHz
See note 3.
This is the A/D Converter
Dynamic Range. ADCIN bit = “1”
See notes 1 and 2
Notes: 1.
2.
3.
“LSB” is defined as V(VRef)/63, “Full Scale” is defined as V(VRef).
[ ] ^{OffsetADC: For an ideal converter, the first transition of its transfer curve occurs at}
amount of deviation between the measured first transition point and the ideal point.
[ ] ^FSErrorADC^{: For an ideal converter, the last transition of its transfer curve occurs}
3¹/2 x V(VRef) _{above zero.}
255
at
251¹/2 x V(VRef)
255
. Full
Offset error
Scale Error
is
is
the
the
amount of deviation between the measured last transition point and the ideal point,
after subtracting the Offset from the measured curve.
DNL_ADC: DNL is defined as the difference between the ideal and the measured code transitions for successive A/D code outputs
expressed in LSBs. The measured transfer curve is adjusted for Offset and Fullscale errors before calculating DNL.
INL_ADC: The deviation of the measured transfer function of an A/D converter from the ideal transfer function. The INL error is also
defined as the sum of the DNL errors starting from code 00h to the code where the INL measurement is desired. The measured
transfer curve is adjusted for Offset and Fullscale errors before calculating INL.
These parameters are periodically sampled and not 100% tested.
REV 3.7 8/26/04
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Characteristics subject to change without notice. 25 of 30