Microchip Technology ADM00310 データシート

ページ / 54
© 2011 Microchip Technology Inc.
DS25048B-page 3
MCP3903
1.0
 ELECTRICAL 
CHARACTERISTICS
The Reliability Targets section includes the absolute
maximum ratings for the device, defining the values
that will cause no long term damage regardless of
duration.
These tables also represent the testing requirements
per the Max. and Min. columns.
1.1
RELIABILITY TARGETS
ABSOLUTE MAXIMUM RATINGS †
V
DD
................................................................................... 7.0V
Digital inputs and outputs w.r.t. A
GND
........-0.6V to V
DD
 +0.6V
Analog input w.r.t. A
GND
..................................... ....-6V to +6V
V
REF
 input w.r.t. A
GND
................................-0.6V to V
DD
 +0.6V
Storage temperature..................................... -65°C to +150°C
Ambient temp. with power applied................ -65°C to +125°C
Soldering temperature of leads (10 seconds)............. +300°C
ESD on the analog inputs (HBM,MM)................. 5.0 kV, 500V
ESD on all other pins (HBM,MM)........................ 5.0 kV, 500V
TABLE 1-1:
ANALOG SPECIFICATIONS TARGET TABLE
Electrical Specifications:
 Unless otherwise indicated, all parameters apply at AV
DD 
= 4.5 to 5.5V, DV
DD
 = 2.7 to 
3.6V, Internal V
REF
, MCLK = 4 MHz;PRESCALE = 1; OSR = 64; f
S
 = 1 MHz; f
D
 = 15.625 ksps; T
A
 = -40°C to +125°C, 
GAIN = 1, V
IN
 = 1V
PP
 = 353mV
RMS
 @ 50/60 Hz.
Param. 
Num.
Symbol
Characteristic
Min.
Typ.
Max.
Units
Test Conditions
Internal Voltage Reference
A001
V
REF
Voltage
-2%
2.35
+2%
V
VREFEXT = 0
A002
TC
REF
Tempco
5
ppm/°C VREFEXT = 0
A003
ZOUT
REF
Output Impedance
7
k
Ω
AV
DD
=5V, 
VREFEXT = 0
Voltage Reference Input
A004
Input Capacitance
10
pF
A005
V
REF
Differential Input Voltage 
Range (V
REF+
 - V
REF-
2.2
2.6
V
V
REF
 = (V
REF+
 - V
REF-
), 
VREFEXT = 1
A006
V
REF+
Absolute Voltage on REFIN+ 
pin
1.9
2.9
V
VREFEXT = 1 
A007
V
REF-
Absolute Voltage on REFIN- 
pin
-0.3
+0.3
V
V
REF- 
should be connected 
to AGND when VREFEXT=0
ADC Performance
A008
Resolution (No Missing 
Codes)
24
bits
OSR = 256 (see 
)
A009
f
S
Sampling Frequency
kHz
f
S
 = DMCLK = MCLK / (4 x 
PRESCALE)
A010
f
D
Output Data Rate
ksps
f
D
 = DRCLK= DMCLK / OSR 
= MCLK / (4 x PRESCALE x 
OSR)
Note 1:
 This specification implies that the ADC output is valid over this entire differential range, i.e. there is no distortion or 
instability across this input range. Dynamic Performance is specified at -0.5 dB below the maximum signal range,
V
IN
 = -0.5 dBFS @ 50/60 Hz = 333 mV
RMS
, V
REF
 = 2.4V.
2:
See terminology section for definition.
3:
This parameter is established by characterization and not 100% tested.
4:
For these operating currents, the following configuration bit settings apply: Config Register Settings: 
SHUTDOWN<5:0> = 000000, RESET<5:0> = 000000; VREFEXT = 0, CLKEXT = 0.
5:
For these operating currents, the following configuration bit settings apply: Config Register Settings: 
SHUTDOWN<5:0> = 111111, VREFEXT = 1, CLKEXT = 1.
6:
Applies to all gains. Offset error is dependant on PGA gain setting.
7:
Outside of this range, ADC accuracy is not specified. An extended input range of +/- 6V can be applied continuously to 
the part with no risk for damage.
8:
For proper operation and to keep ADC accuracy, AMCLK should always be in the range of 1 to 5 MHz with BOOST bits 
off. With BOOST bits on, AMCLK should be in the range of 1 to 8.192 MHz. AMCLK = MCLK/PRESCALE. When using a 
crystal, CLKEXT bit should be equal to ‘0’.