BW1245X BW1245X CMOS 8-bit converter general applications. consis

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BW1245X BW1245X CMOS 8-bit converter general applications. consis

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0.35µm 8-BIT 3MSPS
BW1245X
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.
TYPICAL APPLICATIONS
Hard Disk Drive (HDD) Battery Operated Instruments Motor Control Systems General Applications
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
BW1245X
0.35µm 8-BIT 3MSPS
FUNCTIONAL BLOCK DIAGRAM
VDDD
VSSD
VDDA
VSSA
VBBA
D[7:0]
1-of-28 Decoder Dout Doutb
PWDN
VOUT
R-String
0.35µm 8-BIT 3MSPS
BW1245X
CORE DESCRIPTION
Name D[7:0] PWDN VOUT VDDD VSSA VDDA VSSA VBBA 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
BW1245X
0.35µm 8-BIT 3MSPS
CORE CONFIGURATION
VDDD
VSSD
VDDA
VSSA
VBBA
D[7:0]
bw1245x
VOUT
PWDN
0.35µm 8-BIT 3MSPS
BW1245X
ABSOLUTE MAXIMUM RATINGS
Characteristics Supply Voltage Analog Output Voltage Digital Input Voltage Reference Voltage Operating Temperature Range 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.
BW1245X
0.35µm 8-BIT 3MSPS
ELECTRICAL CHARACTERISTICS
(Converter Specifications VDDA=VDDD=3.3V, VSSA=VSSD=VBBA=0V, PWRDN=High, Top=25°C, VRT=3.3V, VRB=0.0V unless otherwise specified.) Characteristics Resolution Differential Linearity Error Integral Linearity Error Zero Scale Error
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
Full Scale Voltage Error Size
Maximum Output Voltage
NOTES: VZSE=VOUT(D[7:0]=Low) VFSE=VOUT(D[7:0]=High) {(VRT-VRB) 255/256 VRB}
0.35µm 8-BIT 3MSPS
BW1245X
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 Ivdd2 Unit MSPS Conditions Data Rate 3MHz Ivdd1 IVDDA+IVRT+IVDDD Data Rate 3MHz Ivdd2 IVDDA IVDDD Data Rate 3MHz PWRDN=LOW Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH Data Rate 3MHz Data HIGH VDD/2 PWRDN HIGH PWRDN HIGH
Toff
BW1245X
0.35µm 8-BIT 3MSPS
TIMING DIAGRAM
DATA 00000000 11111111
00000000
11111111
00000000
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.
FUCTION 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
output R-string block driven amp. power down mode, only analog current (IVDDA) reduced.
0.35µm 8-BIT 3MSPS
BW1245X
CORE EVALUATION GUIDE
CORE
HOST
TEST PATH PWDN D[7:0] VDDD VSSD 3.3V
3.3V 0.0V
VDDA
3.3V
bw1245x
VSSA
VBBA
VOUT VOUT
Location
Description 10uF TANTALUM CAPACITOR 0.1uF CERAMIC CAPACITOR
TESTABILITY
Whether internal logic testability, required able select values digital inputs (D[9:0]). above figure. Only check main function. (Linearity) Normal Test Condition VRT=3.3V VRB=0.0V PWRDN=High
BW1245X
0.35µm 8-BIT 3MSPS
PHANTOM CELL INFORMATION
PWDN VOUT VDDD VSSD VBBA VDDA VSSA VBBA
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
bw1245x
Name D[7:0] PWDN
Property
Usage Internal External Internal 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 apacitive coupling between signals.
VOUT VDDA
External Internal External External 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.
VSSA VDDD VSSD VBBA
External External External External
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.
0.35µm 8-BIT 3MSPS
BW1245X
PACKAGE CONFIGURATION
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] (0.0V Typ.)
VDDD VDDD
VBBA VBBA
3.3V (VDD) (VSS) 0.0V
VSSD D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
BW1245X
VSSD
VSSZ VSSZ VDDZ VDDZ VSSA VSSA
VDDA VDDA
(3.3V norm operation)
PWDN VOUT VOUT
PWDN
VOUT
(3.3V Typ.)
Location L1~L5
Description 10uF TANTALUM CAPACITOR 0.1uF CERAMIC CAPACITOR FERRITE BEAD 0.1mh
BW1245X
0.35µm 8-BIT 3MSPS
PACKAGE DESCRIPTION
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
0.35µm 8-BIT 3MSPS
BW1245X
BOARD LAYOUT CONSIDERATION
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.
BW1245X
0.35µm 8-BIT 3MSPS
FEEDBACK REQUEST
appreciate your interest products. have further questions, please specify attached form. Thank very much. 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?
0.35µm 8-BIT 3MSPS
BW1245X
HISTORY CARD
Version Date 00.02.22 Modified Items Version updated pictures texts modified with dac1236x's datasheet. format fonts datasheet same with dac1236x's datasheet. Version Updated page power down mode current (®10uA) page (Output Load Resistor) Version Updated page Interal Internal Version Updated page functional description modified. page functon function page phantom cell modified table added. page number modified page Comments Reference datasheet DAC1236X BW1244X BW1244D
01.03.28
01.04.23 02.04.23
BW1245X
0.35µm 8-BIT 3MSPS
NOTES

BW1245X BW1245X CMOS 8-bit converter general applications. consis

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