PNX8510HW/B1,557 NXP Semiconductors, PNX8510HW/B1,557 Datasheet - Page 84

• Manufacturer Part Number: PNX8510HW/B1,557
• Manufacturer: NXP Semiconductors

Specifications of PNX8510HW/B1,557

• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
9397 750 12612
Product data
10.3.2 Sleep and power down modes
10.4 Device initialization
Sleep mode occurs when all current output switches are disabled asynchronously so
that no current flows in either Iout or Idump pins i.e., IOUT = IDUMP = 0. Sleep mode
allows a rapid recovery from a low power consumption state. Each DAC can be put
into sleep mode asynchronously where IOUT = IDUMP = 0, yet still supply current
flows to power the bandgap, opmap, and other analog DAC components, including
the digital logic.
Powerdown mode occurs when each DAC can be asynchronously put into zero state
current so that all current output switches are disabled. This includes current to all
analog and digital components of the DAC such as bandgap reference, opmaps, etc.
In this mode IDDD = IDDA = 0.
The PNX8510/11 must be synchronously reset by providing a video clock to both
clock inputs (DV_CLK1 and DV_CLK2) before the reset line (RESET_N) is pulled
high. This will ensure correct initialization. Failure to follow this sequence may result
in no video output from the PNX8510/11, or similar symptoms.
The I
I2C_SDA pin is only released after the reset sequence is complete. This release
requires that an audio clock is applied to the I2S_AOS1_CLK, in addition to the video
clock applied to DV_CLK1. Therefore, even in applications which do not make use of
the audio functionality of the PNX8510/11, it is still necessary to apply a clock to
I2S_AOS1_CLK.
Fig 34. Video channel DAC programming
2
10-bit current DAC with programmable output level
adjustments of fine and coarse
RSsetnom = 1 kΩ for RL = 37.5 Ω (double termination) RSetmax = 2 kΩ for RL = 75 Ω
ICOMPn = reference currents for up to 6 DACs.
IOUT + IDUMP = 1023I1 = constant, IDUMP = (1023 - D) I1, VDUMP = IOUT x RL, VOUT =
IOUT x RL.
VOUTmin = 15.57 mA x 37.5 Ω = 0.584 V (full-scale, fine adjust = 0%)
VOUTmin = 32.80 mA x 37.5 Ω = 1230 V (full-scale, fine adjust = 0%)
C bus of the PNX8510/11 is disabled during the reset of the device and the
4-bit
M =
PCOMP
V SSA
7 to 7
I ref
adjust
fine



IOUT
Rev. 04 – 12 January 2004
6
ICOMP1
separate output level coarse adjust for each DAC
=


VBG
------------ -
RS
5-bit
N = 0 to 31
PCOMP
×
16.4
--------- -
100
coarse
adjust
I1


=
×
COMP
1
LSBcurrent
+


100
------------------- -
100
10-bit
D = 0 to 1023
+
DAC10
M


⋅
IDUMP
digital
inputs
-------- -
100
IOUT
M
R DUMP =
0.1 or 2
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
×
----------------- -
23 16
28
PNX8510/11
Analog companion chip
V SSA
×
+
N
V SSA
×
D
R O = 2 x 75



R L = R O / 2
MDB662
V SSA
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