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ADS1230IPWR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza ADS1230IPWR
Descripción Electrónicos  20-Bit Analog-to-Digital Converter For Bridge Sensors
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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ADS1230IPWR Datasheet(HTML) 11 Page - Texas Instruments

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VOLTAGE REFERENCE INPUTS
CLOCK SOURCES
Z
EFF
+
1
2f
MODCBUF
Z
EFF
+
1
(2)(76.8kHz)(13fF)
+ 500MW
CLK_DETECT
Internal
Oscillator
MUX
ToADC
S
S0
S1
EN
CLKIN
AVDD
(1)f
MOD =76.8kHz
Z
=500MW
EFF
(1)
REFP
REFN
AVDD
ESD
Protection
C
BUF
ADS1230
SBAS366A – OCTOBER 2006 – REVISED JULY 2007
(REFP, REFN)
The ADS1230 can use an external clock source or
The voltage reference used by the modulator is
internal oscillator to accommodate a wide variety of
generated from the voltage difference between REFP
applications. Figure 20 shows the equivalent circuitry
and REFN: VREF = REFP – REFN. The reference
of
the
clock
source.
The
CLK_DETECT
block
inputs use a structure similar to that of the analog
determines whether the crystal oscillator/external
inputs. In order to increase the reference input
clock signal is applied to the CLKIN pin so that the
impedance, a switching buffer circuitry is used to
internal oscillator is bypassed or activated. When the
reduce
the
input
equivalent
capacitance.
The
CLKIN
pin
frequency
is
above
~200kHz,
the
reference drift and noise impact ADC performance. In
CLK_DETECT output goes low and shuts down the
order to achieve best results, pay close attention to
internal oscillator. When the CLKIN pin frequency is
the
reference
noise
and
drift
specifications.
A
below ~200kHz, the CLK_DETECT output goes high
simplified diagram of the circuitry on the reference
and activates the internal oscillator. It is highly
inputs is shown in Figure 19. The switches and
recommended to hard-wire the CLKIN pin to ground
capacitors can be modeled approximately using an
when the internal oscillator is chosen.
effective impedance of:
Where:
fMOD = modulator sampling frequency (76.8kHz)
CBUF = input capacitance of the buffer
For the ADS1230:
Figure 20. Equivalent Circuitry of the Clock
Source
An external clock may be used by driving the CLKIN
pin directly. The Electrical Characteristics table shows
the allowable frequency range. The clock input may
be driven with 5V logic, regardless of the DVDD or
AVDD voltage.
Figure 19. Simplified Reference Input Circuitry
ESD diodes protect the reference inputs. To prevent
these diodes from turning on, make sure the voltages
on the reference pins do not go below GND by more
than 100mV, and likewise, do not exceed AVDD by
100mV:
GND – 100mV < (REFP or REFN) < AVDD + 100mV
Copyright © 2006–2007, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Link(s): ADS1230


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