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PDF LC78816MC Data sheet ( Hoja de datos )
| Número de pieza | LC78816MC | |
| Descripción | 16-Bit D/A Converter for Use in Digital Audio Products | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN*4250C
Preliminaly
CMOS LSI
LC78816MB, 78816MC
16-Bit D/A Converter for Use in
Digital Audio Products
Overview
The LC78816MB and 78816MC are 16-bit CMOS D/A
converters for use in digital audio products. They employ
a dynamic level shift conversion technique that combines
a resistor string (for the upper 9 bits), PWM (for the
middle 3 bits), and level shifting (for the lower 4 bits).
Features
• Two’s complement data format
• Two D/A converter channels built in (in-phase outputs)
• Maximum conversion frequency of 400 kHz (support for
8 times oversampling)
• Built-in output op amps
• No deglitching circuit required
• Si gate CMOS process (low power consumption)
• 5 V single-voltage power supply
• Low voltage (3.5 V) operation possible
Package Dimensions
unit: mm
3036B-MFP20
[LC78816MB, 78816MC]
SANYO: DIP20
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum power supply voltage
Input voltage
Output voltage
Operating temperature
Storage temperature
Symbol
VDD max
VIN
VOUT
Topr
Tstg
Allowable Operating Ranges
Parameter
Power supply voltage
Reference voltage high
Reference voltage low
Operating temperature
Symbol
VDD
VrefH
VrefL
Topr
Conditions
Ratings
–0.3 to +7.0
–0.3 to VDD + 0.3
–0.3 to VDD + 0.3
–30 to +75
–40 to +125
Unit
V
V
V
°C
°C
Conditions
min
3.5
VDD – 0.3
0
–30
Ratings
typ
5.0
max
5.5
VDD
0.3
+75
Unit
V
V
V
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
63096HA (OT)/D1694TH(OT)/61893JN No. 4250-1/11
1 page  
LC78816MB, 78816MC
Operation
(1) Input of digital audio data
Digital audio data is a 16-bit serial signal in an MSB first two’s complement format.
The 16-bit serial data is read into the IC from MSB on the rising edge of the BCLK signal.
The LC78816MB and 78816MC can handle various interface types.
See the timing charts for details.
DSP ICs for CD players: See timing chart (1)-x when interfacing with the LC7868KE or the 7869E.
(2) Converter operation (See Figure 1.)
The LC78816MB and 78816MC have independent D/A converter circuits for channel 1 and channel 2. These D/A
converters use a dynamic level shift conversion technique that combines resistor string (R-string DAC), PWM (pulse
width modulation), and level shifting D/A converters. After latching, the 16-bit input digital audio data (D15 to D0) is
sent to these separate D/A converters as follows:
Upper 9 bits (D15 to D7): To the R-string DAC.
Middle 3 bits (D6 to D4): To the PWM DAC.
Lower 4 bits (D3 to D0): To the level shifting DAC.
x R-string DAC
The resistor string D/A converter consists of 512 (29) unit resistances (R) connected in series. The voltage applied at
the terminals of this resistor string is divided into 512 equal divisions to form the 9-bit D/A converter outputs.
The upper 9 bits of the input data value are used to select (using a switching circuit) two adjacent potentials, V1 and
V2, from the divided voltages. These are output to the PWM DAC. The relationship between these two voltages is
given by the following formula:
V2 – V1 = (VH – VL)/512
y PWM DAC
The PWM DAC is a 3-bit D/A converter that divides the interval between the two voltages, V1 and V2 output by the
R-string DAC, into 8 using PWM (pulse width modulation).
Either V1 or V2, depending on the value of the middle three bits of the data, is output to the CH1OUT (or CH2OUT)
pin.
SYSCLK is used for the PWM clock when timing chart (2)-y and (2)-z are used, and BCLK is used for all other
timing charts.
z Level Shift DAC
Two variable resistors, VRH and VRL, are connected in series at the ends of the R-string DAC resistor string to
implement a 4-bit D/A converter circuit. The variable resistors VRH and VRL operate as follows in response to the
lower 4 bits of the data value.
• Independent of the data value, the sum of the resistances (VRH + VRL) remains constant.
• According to the data value, VRH and VRL vary in the range from 0 to 15R/128 (where R is the value of the
resistors in the R-string DAC) in steps of R/128.
As a result, the R-string DAC outputs V2 and V1 vary according to the lower 4 bits of the data in steps of ∆V/128
over a range 0 to 15 × ∆V/128 (where ∆V = (VH – VL)/512).
No. 4250-5/11
5 Page 
Sample Application Circuit
LC78816MB, 78816MC
Notes: 1. DVDD and DGND must be connected to the digital system power supply, and AVDD and AGND to the analog system power supply.
2. Use a low impedance high stability power supply (a unit equivalent to a commercial three terminal regulator) for VDD and VrefH.
3. Since latchup is possible if there is a discrepancy between the power supply rise times for pin 4 (AVDD) and pin 10 (DVDD), design the system so
that there is no time lag between the pin 4 and pin 10 power application times.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of December, 1997. Specifications and information herein are subject to
change without notice.
No. 4250-11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LC78816MC.PDF ] | |
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