參數(shù)資料
型號(hào)： PCD6003H
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Digital telephone answering machine chip
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP80
封裝： PLASTIC, QFP-80
文件頁(yè)數(shù)： 64/96頁(yè)
文件大?。?/td> 385K
代理商： PCD6003H
2001 Apr 17
64
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6003
14 ANALOG VOLTAGE REFERENCE (AVR)
14.1
Bandgap reference
The Analog Voltage Reference circuitry (AVR) includes a
bandgap circuit with a nominal output voltage of about
1.25 V. This voltage is used by the power-on reset block
and by the analog voltage source to generate the
reference voltage V
REF
.
Block AVRisalways on,even in System-offmode, and will
consume only a few
μ
A of current. The output of AVR is
directly connected to the power-on reset block and it
determines the power-on reset threshold levels accuracy
in first order. The connection from AVR to the analog
voltage source circuitry (AVS, see Section 14.2) is via an
internal series resistor of about 500 k
(typical). The
voltage after this resistor is connected to pin V
BGP
, which
allows an external capacitor (100 nF) to be connected to
filter out any noise from AVR otherwise entering AVS.
With this configuration the noise at pin V
BGP
will be about
115 dBmp. The pin also allows a direct measurement of
the bandgap voltage, but no current must be drawn.
In order to guarantee a correct start-up of the bandgap
voltage under all conditions, a supply voltage ramp test is
performed on each device. The bandgap voltage is
compared against specified values at the indicated times
(see Fig.30). The test setup intends to reflect the worst
case start-up conditions which may occur in an application
(for initial power-up and after short power drop). Note that
t
rise
is critical and should not be greater than indicated in a
given application. Other indicated times (t
settle
and t
rise
)
reflect the worst case conditions for the device and
therefore can change in the application.
handbook, full pagewidth
MGT445
tfall
tsettle
trise
t
measure VBGP
VDDA
0 V
0.6 V
2.5 V
tfall = 2 ms
tsettle = 45 ms
trise = 20 ms
Fig.30 Bandgap voltage test setup.
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