BW1245X CMOS 8-bit converter general applications. consists 1-of-256 d
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3.3V 8BIT 3MSPS
BW1245X CMOS 8-bit converter general applications. consists 1-of-256 decoder, resistor string with resistors block. maximum conversion rate BW1245X 3MSPS supply voltage 3.3V single.
BW1245X
FEATURES
Resolution 8Bit Differential Linearity Error Integral Linearity Error Maximum Conversion Rate 3MSPS Power Consumption 9.9mW Power Down Mode Operation Temperature Range Power Supply 3.3V Single
TYPICAL APPLICATIONS
Hard Disk Drive (HDD) Battery Operated Instruments Motor Control Systems General Applications
FUNCTIONAL BLOCK DIAGRAM
VDDD
VSSD
VDDA
VSSA
VBBA
D[7:0]
1-of-28 Decoder Dout Doutb
VOUT
R-String
PWDN
(April 2002) responsibility assumed infringements patents other rights third parties that result from use. content this datasheet subject change without notice.
SAMSUNG ELECTRONICS
3.3V 8BIT 3MSPS
CORE DESCRIPTION
NAME
D[7:0] PWDN VOUT VDDD VSSA VDDA VSSA VBBA
BW1245X
TYPE
picc_bb picc_bb pia_bb pia_bb poa_bb vddd vssd vdda vssa vbba
DESCRIPTION
Digital Input Data (8BIT) D[7] D[0] Power Down (Active Low) Voltage Reference Voltage Reference Bottom Analog Voltage Output Digital Power (+3.3V) Digital Ground (0.0V) Analog Power (+3.3V) Analog Ground (0.0V) Analog Bias (0.0V)
TYPE ABBR.
Analog Input Digital Input Analog Output Digital Output Analog Bidirectional Digital Bidirectional Analog Power Digital Power Analog Ground Digital Ground
CORE CONFIGURATION
VDDD
VSSD
VDDA
VSSA
VBBA
D[7:0]
bw1245x
VOUT
PWDN
ASIC
ANALOG
3.3V 8BIT 3MSPS
ABSOLUTE MAXIMUM RATINGS
Characteristics
Supply Voltage Analog Output Voltage Digital Input Voltage Reference Voltage Operating Temperature Range
BW1245X
Symbol
(VDDA,VDDD) VOUT D[7:0] Topr
Value
Unit
NOTES ABSOLUTE MAXIMUM RATING specifies values beyond which device damaged permanently. Exposure ABSOLUTE MAXIMUM RATING conditions extended periods affect reliability. Each condition value applied with other values kept within following operating conditions function operation under these conditions implied. voltages measured with respect VSS(VSSA VSSD VBBA) unless otherwise specified. 100pF capacitor discharged through 1.5k resistor (Human body model)
RECOMMENDED OPERATING CONDITIONS
Characteristics
Supply Voltage Supply Voltage Difference Reference Voltage Digital Input 'Low' Voltage Digital Input 'High' Voltage Operating Temperature
Symbol
VDDA VSSA VDDD VSSD VDDA VDDD Topr
3.15 -0.1
3.45
Unit
NOTE strongly recommended that avoid power latch-up supply pins(VDDA,VDDD) driven from same source.
ASIC
ANALOG
3.3V 8BIT 3MSPS
ELECTRICAL CHARACTERISTICS
(Converter Specifications VDDA=VDDD=3.3V, VSSA=VSSD=VBBA=0V, PWDN=High, Top=25° VRT=3.3V, VRB=0.0V unless otherwise specified.)
BW1245X
Characteristics
Resolution Differential Linearity Error Integral Linearity Error Zero Scale Error1 Full Scale Voltage Error2 Maximum Output Voltage Size
NOTE
Symbol
VZSE VFSE VoMAX VLSB
3.245 12.73
3.281 12.86
3.287 12.89
Unit
Bits
Conditions
VRT=3.3V VRB=0.0V VoMAX VOUT(D[7:0]=High) VLSB VoMAX
VZSE=VOUT(D[7:0]=Low) VFSE=VOUT(D[7:0]=High) {(VRT-VRB) 255/256 VRB}
ELECTRICAL CHARACTERISTICS
(Converter Specifications VDDA=VDDD=3.3V, VSSA=VSSD=VBBA=0V, load cap=25pF Top=25°C, VRT=3.3V, VRB=0.0V unless otherwise specified.)
Characteristics
Maximum Conversion Rate Dynamic Supply Current Dynamic Supply Current (Power Down Mode) Analog Output Delay Analog Output Rise Time Analog Output Fall Time Analog Output Settling Time Power Down Time Power Down Time
Symbol
Ivdd1
Unit
Conditions
MSPS Data Rate 3MHz Ivdd1 IVDDA IVRT IVDDD Data Rate 3MHz Ivdd2 IVDDA IVDDD Data Rate 3MHz PWDN=LOW Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH VDD/2 PWDN HIGH PWDN HIGH
Ivdd2
Toff
ASIC
ANALOG
3.3V 8BIT 3MSPS
TIMING DIAGRAM
DATA 00000000 11111111 00000000 11111111 00000000
BW1245X
VOUT DATA
VOUT
DATA
00000000
11111111
00000000 0.5LSB
VOUT
PWDN
VOUT
0.5LSB 0.0V
Toff
0.5LSB
Output delay measured from point rising edge input data full scale transition. Settling time measured from point full scale transition output remaining within ±1/2 LSB. Output rise/fall time measured between points full scale transition.
FUNCTIONAL DESCRIPTION
bw1245x 1-of-256 decoder, R-String Block 8bit block driving output. decoder digital outputs only them valid. R-string block consists R-array with resistors CMOS switches decides output voltage according digital inputs generated 1-of-256 decoder.
VRstring
*Dn)
output R-string block driven amp. power down mode, only analog current (IVDDA) reduced.
ASIC
ANALOG
3.3V 8BIT 3MSPS
CORE EVALUATION GUIDE
BW1245X
HOST CORE
TEST PATH
PWDN
D[7:0]
3.3V 3.3V
VDDD
TESTABILITY
Whether internal logic testability, required able select values digital inputs D[7:0] above figure. Only check main function. Linearity Normal Test Condition VRT=3.3V VRB=0.0V PWDN=High
ASIC
3.3V
VSSD
0.0V
VDDA
bw1245x
VSSA
VBBA
VOUT
LOCATION
DESCRIPTION
10uF TANTALUM CAPACITOR 0.1uF CERAMIC CAPACITOR
VOUT
ANALOG
3.3V 8BIT 3MSPS
PHANTOM CELL INFORMATION
BW1245X
PWDN
VBBA VBBA VSSD VSSD VDDD VDDD D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
VBBA VSSA VDDA
VOUT
bw1245x
Name
D[7:0] PWDN VOUT VDDA VSSA VDDD VSSD VBBA
Property
Usage
Internal External Internal External External External Internal External External External External External External
Layout Guide
Digital Input Signal lines must have same length reduce propagation delay. Voltage reference lines (VRT VRB) must wide metal reduce voltage drop metal lines. VOUT signal should crossed signals should next digital signals minimize capacitive coupling between signals. recommended that thick analog power metal. When connected PAD, path should kept short possible. Digital power analog power separately used. VBBA ports they connected internally, connect just them with VBBA pad.
When core block connected other blocks, must double guard-ring using N-well active remove substrate coupling noise. that case, power metal should connected directly. Bulk power used reduce influence substrate noise.
ASIC
ANALOG
3.3V 8BIT 3MSPS
PACKAGE CONFIGURATION
BW1245X
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] (0.0V Typ.)
VDDD VDDD VSSD VSSD D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
VBBA VBBA VSSZ VSSZ VDDZ VDDZ VSSA VSSA VDDA VDDA PWDN VOUT VOUT
(3.3V Typ.) VOUT
(3.3V normal operation)
BW1245X BW1245X
L1~L5
(VSS) 0.0V 3.3V (VDD)
PWDN
LOCATION
DESCRIPTION
10uF TANTALUM CAPACITOR 0.1uF CERAMIC CAPACITOR FERRITE BEAD 0.1mh
ASIC
ANALOG
3.3V 8BIT 3MSPS
PACKAGE DESCRIPTION
BW1245X
NAME
VDDD VSSD D[7:0] VOUT PWDN VDDA VSSA VDDZ VSSZ VBBA
10~17 23,24 25,26 29,30 36,37 38,39 41,42 43,44 47,48 5,6,7,8,9,18,19 20,21,22,27 28,32,33,34 35,40,45,46
TYPE
DESCRIPTION
Digital Power (3.3V) Digital Ground (0.0V) Digital Input Data Voltage Reference Bottom (0.0V) Voltage Reference (3.3V) Analog Voltage Output Power Down Mode (Low Active) Analog Power (3.3V) Analog Ground (0.0V) Power (3.3V) Ground (0.0V) Analog Bias (0.0V)
Connection
TYPE ABBR.
Analog Input Digital Input Analog Output Digital Output Analog Bidirectional Digital Bidirectional Analog Power Digital Power Analog Ground Digital Ground
ASIC
ANALOG
3.3V 8BIT 3MSPS
BOARD LAYOUT CONSIDERATION
BW1245X
Board Considerations
minimize noise power lines ground lines, digital inputs need shielded decoupled. This trace length between groups (VDDA,VDDD) (VSSA,VSSD) pins should short possible minimize inductive ringing.
Supply Decoupling Planes
decoupling capacitor between power line ground line, 0.1uF ceramic capacitor used parallel with 10uF tantalum capacitor. digital power plane(VDDD) analog power plane(VDDA) connected through ferrite bead, also digital ground plane(VSSD) analog ground plane(VSSA). This ferrite bead should located within 3inches BW1245X. analog power plane supplies power BW1245X analog output related devices.
ASIC
ANALOG
3.3V 8BIT 3MSPS
FEEDBACK REQUEST
appreciate your interest products. have further questions, please specify attached form. Thank very much.
BW1245X
ELECTRICAL CHARACTERISTIC Characteristics
Supply Voltage Power dissipation Resolution Analog Output Voltage Operating Temperature Output Load Capacitor Output Load Resistor Integral Non-Linearity Error Differential Non-Linearity Error Maximum Conversion Rate
Unit
Bits
Remarks
VOLTAGE OUTPUT
Reference Voltage BOTTOM Analog Output Voltage Range Digital Input Format Binary Code Complement Code
CURRENT OUTPUT
Analog Output Maximum Current Analog Output Maximum Signal Frequency Reference Voltage External Resistor Current Setting(RSET) Pipeline Delay
want Power down mode? want Internal Reference Voltage(BGR)? Which want serial input data type parallel input data type? need power supply your system?
ASIC
ANALOG
3.3V 8BIT 3MSPS
HISTORY CARD
Version Date Modified Items
BW1245X
Comments
Reference datasheet DAC1236X BW1244X BW1244D
Version updated pictures texts modified with dac1236x's datasheet. 00.02.22 format fonts datasheet same with dac1236x's datasheet. Version Updated 01.03.28 page power down mode current (10uA) page (Output Load Resistor) Version Updated page Interal Internal Version Updated page functional description modified. page functon function 02.04.23 page phantom cell modified table added. page number modified page 01.04.23
ASIC
ANALOG
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