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PDF SAD1009 Data sheet ( Hoja de datos )
| Número de pieza | SAD1009 | |
| Descripción | Universal DAC | |
| Fabricantes | Philips | |
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Philips Semiconductors
Universal DAC (UDAC)
Preliminary specification
SAD1009
GENERAL DESCRIPTION
The SAD1009 is intended as a peripheral to a microcontroller-based servo system in video cassette recorders.
The device relieves the microcontroller of some of the real time functions. These functions include; generation of
programmable pulse width signals (duty factor etc.) and accurate measurement of time period signals (tacho signal etc.).
The SAD1009 has nine programmable output ports. All functions of the UDAC are programmable. Commands and data
from the microcontroller are loaded via a bidirectional bus using a 16-bit format. Data from the time period measurement
is transferred to the microcontroller via the same bidirectional bus, also using a 16-bit format. The clock signal for this
device is provided by the quartz oscillator of the microcontroller.
Features
• Generation of programmable pulse width signals
• Measurement of time period signals
• All functions are programmable
QUICK REFERENCE DATA
PARAMETER
Supply
Supply voltage range
Inputs
Input voltage
LOW
HIGH
Input leakage current
Input capacitance
Outputs
Output voltage
LOW
HIGH
Output sink current
Output source current
CONDITIONS
IOL = 1,6 mA
IOH = − 1,0 mA
SYMBOL
MIN.
TYP. MAX. UNIT
VDD 4,75
5,0 5,25 V
VIL −−
VIH 2,4
± II −−
CI −−
0,8 V
−− V
1 µA
7,5 pF
VOL −−
0,4 V
VOH
VDD −0,4
−−
V
IO −−
1,6 mA
− IO −−
1,0 mA
PACKAGE OUTLINES
SAD1009P: 24-lead DIL; plastic (SOT101A); SOT101-1; 1996 November 18.
SAD1009T: 24-lead mini-pack; plastic (SO24; SOT137A); SOT 137-1; 1996 November 18.
January 1991
2
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1 page  
Philips Semiconductors
Universal DAC (UDAC)
Preliminary specification
SAD1009
Fig.3 Program reception cycle: a) normal reception cycle; b) no information is loaded into the input buffer,
the RAMs contents remain unchanged.
Pulse width modulated outputs
The UDAC has seven pulse width modulated outputs (PPW1 to PPW7). The output PPW1 is slightly different to outputs
PPW2 to PPW7, the difference is explained below. Each output produces a pulse width modulated signal with a duty
factor programmable in steps of 1/256 and has a repetition frequency of approximately 23 kHz. These pseudo analogue
signals are used to control the capstan and reel drives. Motor control can be performed in the following ways:
• convert the pulse width modulated signal into an analogue signal using filtering and analogue power amplification
• by feeding the pulse width modulated signal to the motor via a power switch and a switch mode filter
To conserve power use the second method for control of the capstain and reel motors. For the scanner control two
outputs are available, so that by weighted addition a higher resolution can be achieved.
PPW1 is also an 8-bit programmable output, with a repetition frequency of 23 kHz. The difference is the low frequency
contents of the signal are reduced by changing the distribution of the HIGH and LOW level portions. This redistribution
means that a filter with two poles; each at 43 µs, is sufficient to reduce the peak-to-peak ripple to less than 1 LSB.
This output is for use in applications where long filter delays are not tolerated.
January 1991
6
5 Page 
Philips Semiconductors
Universal DAC (UDAC)
Preliminary specification
SAD1009
A.C. CHARACTERISTICS
PARAMETER
CONDITIONS
RXD, R/O, Q0 to Q7
Output transition time CL = 50 pF
LOW-to-HIGH
HIGH-to-LOW
FOSC
Maximum pulse
frequency
Minimum pulse width
LOW
HIGH
M1 = L
M1 = H
TXD
Pulse frequency
Pulse width
LOW
HIGH
RXD
Set-up time
RXD to TXD
Hold time
RXD to TXD
RXD
Propagation delay
TXD to RXD
R/O to RXD
S/L
used as input;
see Fig.5
used as output;
see Fig.6
see Fig.7
Pulse width LOW
Set-up time
TXD to S/L
Hold time
TXD to S/L
Propagation delay
S/L to Q0 − Q7
SYMBOL
MIN.
TYP. MAX.
UNIT
tTLH − − 30 ns
tTHL − − 30 ns
fmax − − 12 MHz
fmax − − 6 MHz
tWL 20 − − ns
tWH 20 − − ns
fmax − − 6 MHz
tWL 50 − − ns
tWH 50 − − ns
tSURXD
tHDRXD
50 −−
50 −−
ns
ns
tPRXD
tPR/O
−− 50 ns
− − 50 ns
tSUTXD
tHDTXD
tp
50 − − ns
50 − − ns
− − 50 ns
January 1991
12
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SAD1009.PDF ] | |
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